Re: cisco 877W: dhcp client issue

nathan.murr · ‎05-31-2011

Hi all! Trying to add a redundant ISP connection to 877 unit in order to failover the main one (dsl).

The new ISP gives ethernet and uses dhcp.

sh ver:

Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(24)T5, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Fri 04-Mar-11 07:45 by prod_rel_team

ROM: System Bootstrap, Version 12.3(8r)YI2, RELEASE SOFTWARE

877w-home uptime is 3 hours, 10 minutes
System returned to ROM by reload
System image file is "flash:c870-advipservicesk9-mz.124-24.T5.bin"
Last reload reason: Reload Command

This product contains cryptographic features and is subject to United
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Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

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http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco 877W (MPC8272) processor (revision 0x200) with 118784K/12288K bytes of mem ory.
Processor board ID FCZ1015214Z
MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10
4 FastEthernet interfaces
1 ATM interface
1 802.11 Radio
128K bytes of non-volatile configuration memory.
24576K bytes of processor board System flash (Intel Strataflash)

Configuration register is 0x2102

Here's the dhcp config part:

interface Vlan3
 ip address dhcp
end

interface FastEthernet1
 description -= ISP =-
 switchport access vlan 3
end

Can't get the IP address and other dhcp options. The debug dhcp detail goes:

*Apr 11 14:11:00.428: DHCP: new entry. add to queue, interface Vlan3
*Apr 11 14:11:00.428: DHCP: SDiscover attempt # 1 for entry:
*Apr 11 14:11:00.428: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:11:00.428: Temp sub net mask: 0.0.0.0
*Apr 11 14:11:00.428:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:11:00.428:    DHCP transaction id: 2D3
*Apr 11 14:11:00.428:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:11:00.428:    Next timer fires after: 00:00:04
*Apr 11 14:11:00.432:    Retry count: 1   Client-ID: 0013.a940.8263
*Apr 11 14:11:00.432:    Client-ID hex dump: 0013A9408263
*Apr 11 14:11:00.432:    Hostname: 877w-home
*Apr 11 14:11:00.432: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:11:00.432: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:11:00.432: DHCP: SDiscover 290 bytes
*Apr 11 14:11:00.432:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:11:04.357: DHCP: SDiscover attempt # 2 for entry:
*Apr 11 14:11:04.357: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:11:04.357: Temp sub net mask: 0.0.0.0
*Apr 11 14:11:04.357:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:11:04.357:    DHCP transaction id: 2D3
*Apr 11 14:11:04.357:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:11:04.357:    Next timer fires after: 00:00:04
*Apr 11 14:11:04.357:    Retry count: 2   Client-ID: 0013.a940.8263
*Apr 11 14:11:04.357:    Client-ID hex dump: 0013A9408263
*Apr 11 14:11:04.357:    Hostname: 877w-home
*Apr 11 14:11:04.357: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:11:04.357: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:11:04.357: DHCP: SDiscover 290 bytes
*Apr 11 14:11:04.357:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:11:08.358: DHCP: SDiscover attempt # 3 for entry:
*Apr 11 14:11:08.358: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:11:08.358: Temp sub net mask: 0.0.0.0
*Apr 11 14:11:08.358:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:11:08.358:    DHCP transaction id: 2D3
*Apr 11 14:11:08.358:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:11:08.358:    Next timer fires after: 00:00:04
*Apr 11 14:11:08.358:    Retry count: 3   Client-ID: 0013.a940.8263
*Apr 11 14:11:08.358:    Client-ID hex dump: 0013A9408263
*Apr 11 14:11:08.358:    Hostname: 877w-home
*Apr 11 14:11:08.358: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:11:08.358: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:11:08.358: DHCP: SDiscover 290 bytes
*Apr 11 14:11:08.362:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:11:12.359: DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible
*Apr 11 14:11:20.909: DHCP: Waiting for 15 seconds on interface Vlan3
*Apr 11 14:11:35.912: DHCP: Try 4 to acquire address for Vlan3
*Apr 11 14:11:35.912: DHCP: allocate request
*Apr 11 14:11:35.912: DHCP: zapping entry in DHC_PURGING state for Vl3
*Apr 11 14:11:35.912: DHCP: deleting entry 85092010 0.0.0.0 from list
*Apr 11 14:11:35.912: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:11:35.912: Temp sub net mask: 0.0.0.0
*Apr 11 14:11:35.912:    DHCP Lease server: 0.0.0.0, state: 11 Purging
*Apr 11 14:11:35.912:    DHCP transaction id: 2D3
*Apr 11 14:11:35.916:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:11:35.916:    Next timer fires after: 00:00:16
*Apr 11 14:11:35.916:    Retry count: 0   Client-ID: 0013.a940.8263
*Apr 11 14:11:35.916:    Client-ID hex dump: 0013A9408263
*Apr 11 14:11:35.916:    Hostname: 877w-home
*Apr 11 14:11:35.916: DHCP: new entry. add to queue, interface Vlan3
*Apr 11 14:11:35.916: DHCP: SDiscover attempt # 1 for entry:
*Apr 11 14:11:35.916: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:11:35.916: Temp sub net mask: 0.0.0.0
*Apr 11 14:11:35.916:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:11:35.916:    DHCP transaction id: 2D4
*Apr 11 14:11:35.916:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:11:35.916:    Next timer fires after: 00:00:04
*Apr 11 14:11:35.916:    Retry count: 1   Client-ID: 0013.a940.8263
*Apr 11 14:11:35.916:    Client-ID hex dump: 0013A9408263
*Apr 11 14:11:35.916:    Hostname: 877w-home
*Apr 11 14:11:35.916: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:11:35.920: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:11:35.920: DHCP: SDiscover 290 bytes
*Apr 11 14:11:35.920:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:11:39.377: DHCP: SDiscover attempt # 2 for entry:
*Apr 11 14:11:39.377: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:11:39.377: Temp sub net mask: 0.0.0.0
*Apr 11 14:11:39.377:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:11:39.377:    DHCP transaction id: 2D4
*Apr 11 14:11:39.377:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:11:39.377:    Next timer fires after: 00:00:04
*Apr 11 14:11:39.377:    Retry count: 2   Client-ID: 0013.a940.8263
*Apr 11 14:11:39.377:    Client-ID hex dump: 0013A9408263
*Apr 11 14:11:39.377:    Hostname: 877w-home
*Apr 11 14:11:39.377: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:11:39.377: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:11:39.377: DHCP: SDiscover 290 bytes
*Apr 11 14:11:39.381:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:11:43.378: DHCP: SDiscover attempt # 3 for entry:
*Apr 11 14:11:43.378: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:11:43.378: Temp sub net mask: 0.0.0.0
*Apr 11 14:11:43.378:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:11:43.378:    DHCP transaction id: 2D4
*Apr 11 14:11:43.378:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:11:43.378:    Next timer fires after: 00:00:04
*Apr 11 14:11:43.378:    Retry count: 3   Client-ID: 0013.a940.8263
*Apr 11 14:11:43.378:    Client-ID hex dump: 0013A9408263
*Apr 11 14:11:43.378:    Hostname: 877w-home
*Apr 11 14:11:43.378: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:11:43.378: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:11:43.378: DHCP: SDiscover 290 bytes
*Apr 11 14:11:43.382:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:11:47.379: DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible
*Apr 11 14:11:56.389: DHCP: Waiting for 20 seconds on interface Vlan3
*Apr 11 14:12:16.389: DHCP: Try 5 to acquire address for Vlan3
*Apr 11 14:12:16.389: DHCP: allocate request
*Apr 11 14:12:16.389: DHCP: zapping entry in DHC_PURGING state for Vl3
*Apr 11 14:12:16.389: DHCP: deleting entry 850950B8 0.0.0.0 from list
*Apr 11 14:12:16.389: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:12:16.389: Temp sub net mask: 0.0.0.0
*Apr 11 14:12:16.389:    DHCP Lease server: 0.0.0.0, state: 11 Purging
*Apr 11 14:12:16.393:    DHCP transaction id: 2D4
*Apr 11 14:12:16.393:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:12:16.393:    Next timer fires after: 00:00:11
*Apr 11 14:12:16.393:    Retry count: 0   Client-ID: 0013.a940.8263
*Apr 11 14:12:16.393:    Client-ID hex dump: 0013A9408263
*Apr 11 14:12:16.393:    Hostname: 877w-home
*Apr 11 14:12:16.393: DHCP: new entry. add to queue, interface Vlan3
*Apr 11 14:12:16.393: DHCP: SDiscover attempt # 1 for entry:
*Apr 11 14:12:16.393: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:12:16.393: Temp sub net mask: 0.0.0.0
*Apr 11 14:12:16.393:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:12:16.397:    DHCP transaction id: 2D5
*Apr 11 14:12:16.397:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:12:16.397:    Next timer fires after: 00:00:04
*Apr 11 14:12:16.397:    Retry count: 1   Client-ID: 0013.a940.8263
*Apr 11 14:12:16.397:    Client-ID hex dump: 0013A9408263
*Apr 11 14:12:16.397:    Hostname: 877w-home
*Apr 11 14:12:16.397: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:12:16.397: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:12:16.397: DHCP: SDiscover 290 bytes
*Apr 11 14:12:16.397:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:12:20.386: DHCP: SDiscover attempt # 2 for entry:
*Apr 11 14:12:20.386: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:12:20.386: Temp sub net mask: 0.0.0.0
*Apr 11 14:12:20.386:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:12:20.386:    DHCP transaction id: 2D5
*Apr 11 14:12:20.386:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:12:20.386:    Next timer fires after: 00:00:04
*Apr 11 14:12:20.386:    Retry count: 2   Client-ID: 0013.a940.8263
*Apr 11 14:12:20.386:    Client-ID hex dump: 0013A9408263
*Apr 11 14:12:20.386:    Hostname: 877w-home
*Apr 11 14:12:20.386: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:12:20.390: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:12:20.390: DHCP: SDiscover 290 bytes
*Apr 11 14:12:20.390:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:12:24.403: DHCP: SDiscover attempt # 3 for entry:
*Apr 11 14:12:24.403: Temp IP addr: 0.0.0.0 for peer on Interface: Vlan3
*Apr 11 14:12:24.403: Temp sub net mask: 0.0.0.0
*Apr 11 14:12:24.403:    DHCP Lease server: 0.0.0.0, state: 3 Selecting
*Apr 11 14:12:24.403:    DHCP transaction id: 2D5
*Apr 11 14:12:24.403:    Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
*Apr 11 14:12:24.407:    Next timer fires after: 00:00:04
*Apr 11 14:12:24.407:    Retry count: 3   Client-ID: 0013.a940.8263
*Apr 11 14:12:24.407:    Client-ID hex dump: 0013A9408263
*Apr 11 14:12:24.407:    Hostname: 877w-home
*Apr 11 14:12:24.407: DHCP: SDiscover placed class-id option: 64736C666F72756D2E6F7267
*Apr 11 14:12:24.407: DHCP: SDiscover: sending 290 byte length DHCP packet
*Apr 11 14:12:24.407: DHCP: SDiscover 290 bytes
*Apr 11 14:12:24.407:               B'cast on Vlan3 interface from 0.0.0.0
*Apr 11 14:12:28.404: DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible

Connecting the PC directly to the ISP brings no problems with DHCP.

Tried using IOS ver 15 and disabling some dhcp clinent options such as request tftp-server-address - no good.

Here's the wireshark dump with bootp filter (.pcap attached):

No.     Time     Source                Destination           Protocol Info
  10087 22:34:31 0.0.0.0               255.255.255.255       DHCP     DHCP Discover - Transaction ID 0x808

Frame 10087: 618 bytes on wire (4944 bits), 618 bytes captured (4944 bits)
    Arrival Time: May 31, 2011 22:34:31.104220000 Russian Daylight Time
    Epoch Time: 1306866871.104220000 seconds
    [Time delta from previous captured frame: 0.000242000 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 17.884008000 seconds]
    Frame Number: 10087
    Frame Length: 618 bytes (4944 bits)
    Capture Length: 618 bytes (4944 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:udp:bootp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: Cisco_81:de:2a (00:17:5a:81:de:2a), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
    Source: Cisco_81:de:2a (00:17:5a:81:de:2a)
        Address: Cisco_81:de:2a (00:17:5a:81:de:2a)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 604
    Identification: 0x20e6 (8422)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 255
    Protocol: UDP (17)
    Header checksum: 0x98ab [correct]
        [Good: True]
        [Bad: False]
    Source: 0.0.0.0 (0.0.0.0)
    Destination: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 584
    Checksum: 0xf05c [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x00000808
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 0.0.0.0 (0.0.0.0)
    Next server IP address: 0.0.0.0 (0.0.0.0)
    Relay agent IP address: 0.0.0.0 (0.0.0.0)
    Client MAC address: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (t=53,l=1) DHCP Message Type = DHCP Discover
        Option: (53) DHCP Message Type
        Length: 1
        Value: 01
    Option: (t=57,l=2) Maximum DHCP Message Size = 1152
        Option: (57) Maximum DHCP Message Size
        Length: 2
        Value: 0480
    Option: (t=61,l=25) Client identifier
        Option: (61) Client identifier
        Length: 25
        Value: 00636973636f2d303031372e356138312e646532612d566c...
    Option: (t=12,l=9) Host Name = "877w-home"
        Option: (12) Host Name
        Length: 9
        Value: 383737772d686f6d65
    Option: (t=55,l=8) Parameter Request List
        Option: (55) Parameter Request List
        Length: 8
        Value: 01060f2c0321962b
        1 = Subnet Mask
        6 = Domain Name Server
        15 = Domain Name
        44 = NetBIOS over TCP/IP Name Server
        3 = Router
        33 = Static Route
        150 = TFTP server address
        43 = Vendor-Specific Information
    Option: (t=60,l=12) Vendor class identifier = "dslforum.org"
        Option: (60) Vendor class identifier
        Length: 12
        Value: 64736c666f72756d2e6f7267
    End Option
    Padding

No.     Time     Source                Destination           Protocol Info
  10090 22:34:31 10.244.9.26           10.251.0.2            DHCP     DHCP Offer    - Transaction ID 0x808

Frame 10090: 349 bytes on wire (2792 bits), 349 bytes captured (2792 bits)
    Arrival Time: May 31, 2011 22:34:31.111167000 Russian Daylight Time
    Epoch Time: 1306866871.111167000 seconds
    [Time delta from previous captured frame: 0.001886000 seconds]
    [Time delta from previous displayed frame: 0.006947000 seconds]
    [Time since reference or first frame: 17.890955000 seconds]
    Frame Number: 10090
    Frame Length: 349 bytes (2792 bits)
    Capture Length: 349 bytes (2792 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:udp:bootp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: D-Link_f7:c1:c5 (5c:d9:98:f7:c1:c5), Dst: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Destination: Cisco_81:de:2a (00:17:5a:81:de:2a)
        Address: Cisco_81:de:2a (00:17:5a:81:de:2a)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Source: D-Link_f7:c1:c5 (5c:d9:98:f7:c1:c5)
        Address: D-Link_f7:c1:c5 (5c:d9:98:f7:c1:c5)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 10.244.9.26 (10.244.9.26), Dst: 10.251.0.2 (10.251.0.2)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 335
    Identification: 0xc80c (51212)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: UDP (17)
    Header checksum: 0x9287 [correct]
        [Good: True]
        [Bad: False]
    Source: 10.244.9.26 (10.244.9.26)
    Destination: 10.251.0.2 (10.251.0.2)
User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68)
    Source port: bootps (67)
    Destination port: bootpc (68)
    Length: 315
    Checksum: 0xcf98 [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Bootstrap Protocol
    Message type: Boot Reply (2)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 1
    Transaction ID: 0x00000808
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 10.251.0.2 (10.251.0.2)
    Next server IP address: 0.0.0.0 (0.0.0.0)
    Relay agent IP address: 10.244.9.26 (10.244.9.26)
    Client MAC address: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (t=53,l=1) DHCP Message Type = DHCP Offer
        Option: (53) DHCP Message Type
        Length: 1
        Value: 02
    Option: (t=54,l=4) DHCP Server Identifier = 10.251.0.1
        Option: (54) DHCP Server Identifier
        Length: 4
        Value: 0afb0001
    Option: (t=1,l=4) Subnet Mask = 255.255.0.0
        Option: (1) Subnet Mask
        Length: 4
        Value: ffff0000
    Option: (t=61,l=7) Client identifier
        Option: (61) Client identifier
        Length: 7
        Value: 01000000000000
        Hardware type: Ethernet
        Client MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Option: (t=3,l=4) Router = 10.251.0.1
        Option: (3) Router
        Length: 4
        Value: 0afb0001
    Option: (t=51,l=4) IP Address Lease Time = 15 minutes
        Option: (51) IP Address Lease Time
        Length: 4
        Value: 00000384
    Option: (t=6,l=8) Domain Name Server
        Option: (6) Domain Name Server
        Length: 8
        Value: c362a01a00000000
        IP Address: 195.98.160.26
        IP Address: 0.0.0.0
    End Option
    Padding

No.     Time     Source                Destination           Protocol Info
  12297 22:34:35 0.0.0.0               255.255.255.255       DHCP     DHCP Discover - Transaction ID 0x808

Frame 12297: 618 bytes on wire (4944 bits), 618 bytes captured (4944 bits)
    Arrival Time: May 31, 2011 22:34:35.034770000 Russian Daylight Time
    Epoch Time: 1306866875.034770000 seconds
    [Time delta from previous captured frame: 0.001531000 seconds]
    [Time delta from previous displayed frame: 3.923603000 seconds]
    [Time since reference or first frame: 21.814558000 seconds]
    Frame Number: 12297
    Frame Length: 618 bytes (4944 bits)
    Capture Length: 618 bytes (4944 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:udp:bootp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: Cisco_81:de:2a (00:17:5a:81:de:2a), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
    Source: Cisco_81:de:2a (00:17:5a:81:de:2a)
        Address: Cisco_81:de:2a (00:17:5a:81:de:2a)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 604
    Identification: 0x20ee (8430)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 255
    Protocol: UDP (17)
    Header checksum: 0x98a3 [correct]
        [Good: True]
        [Bad: False]
    Source: 0.0.0.0 (0.0.0.0)
    Destination: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 584
    Checksum: 0xf05c [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x00000808
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 0.0.0.0 (0.0.0.0)
    Next server IP address: 0.0.0.0 (0.0.0.0)
    Relay agent IP address: 0.0.0.0 (0.0.0.0)
    Client MAC address: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (t=53,l=1) DHCP Message Type = DHCP Discover
        Option: (53) DHCP Message Type
        Length: 1
        Value: 01
    Option: (t=57,l=2) Maximum DHCP Message Size = 1152
        Option: (57) Maximum DHCP Message Size
        Length: 2
        Value: 0480
    Option: (t=61,l=25) Client identifier
        Option: (61) Client identifier
        Length: 25
        Value: 00636973636f2d303031372e356138312e646532612d566c...
    Option: (t=12,l=9) Host Name = "877w-home"
        Option: (12) Host Name
        Length: 9
        Value: 383737772d686f6d65
    Option: (t=55,l=8) Parameter Request List
        Option: (55) Parameter Request List
        Length: 8
        Value: 01060f2c0321962b
        1 = Subnet Mask
        6 = Domain Name Server
        15 = Domain Name
        44 = NetBIOS over TCP/IP Name Server
        3 = Router
        33 = Static Route
        150 = TFTP server address
        43 = Vendor-Specific Information
    Option: (t=60,l=12) Vendor class identifier = "dslforum.org"
        Option: (60) Vendor class identifier
        Length: 12
        Value: 64736c666f72756d2e6f7267
    End Option
    Padding

No.     Time     Source                Destination           Protocol Info
  14544 22:34:39 0.0.0.0               255.255.255.255       DHCP     DHCP Discover - Transaction ID 0x808

Frame 14544: 618 bytes on wire (4944 bits), 618 bytes captured (4944 bits)
    Arrival Time: May 31, 2011 22:34:39.035641000 Russian Daylight Time
    Epoch Time: 1306866879.035641000 seconds
    [Time delta from previous captured frame: 0.000780000 seconds]
    [Time delta from previous displayed frame: 4.000871000 seconds]
    [Time since reference or first frame: 25.815429000 seconds]
    Frame Number: 14544
    Frame Length: 618 bytes (4944 bits)
    Capture Length: 618 bytes (4944 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:udp:bootp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: Cisco_81:de:2a (00:17:5a:81:de:2a), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
    Source: Cisco_81:de:2a (00:17:5a:81:de:2a)
        Address: Cisco_81:de:2a (00:17:5a:81:de:2a)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 604
    Identification: 0x20f1 (8433)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 255
    Protocol: UDP (17)
    Header checksum: 0x98a0 [correct]
        [Good: True]
        [Bad: False]
    Source: 0.0.0.0 (0.0.0.0)
    Destination: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 584
    Checksum: 0xf05c [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x00000808
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 0.0.0.0 (0.0.0.0)
    Next server IP address: 0.0.0.0 (0.0.0.0)
    Relay agent IP address: 0.0.0.0 (0.0.0.0)
    Client MAC address: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (t=53,l=1) DHCP Message Type = DHCP Discover
        Option: (53) DHCP Message Type
        Length: 1
        Value: 01
    Option: (t=57,l=2) Maximum DHCP Message Size = 1152
        Option: (57) Maximum DHCP Message Size
        Length: 2
        Value: 0480
    Option: (t=61,l=25) Client identifier
        Option: (61) Client identifier
        Length: 25
        Value: 00636973636f2d303031372e356138312e646532612d566c...
    Option: (t=12,l=9) Host Name = "877w-home"
        Option: (12) Host Name
        Length: 9
        Value: 383737772d686f6d65
    Option: (t=55,l=8) Parameter Request List
        Option: (55) Parameter Request List
        Length: 8
        Value: 01060f2c0321962b
        1 = Subnet Mask
        6 = Domain Name Server
        15 = Domain Name
        44 = NetBIOS over TCP/IP Name Server
        3 = Router
        33 = Static Route
        150 = TFTP server address
        43 = Vendor-Specific Information
    Option: (t=60,l=12) Vendor class identifier = "dslforum.org"
        Option: (60) Vendor class identifier
        Length: 12
        Value: 64736c666f72756d2e6f7267
    End Option
    Padding

No.     Time     Source                Destination           Protocol Info
  24412 22:34:56 0.0.0.0               255.255.255.255       DHCP     DHCP Discover - Transaction ID 0x809

Frame 24412: 618 bytes on wire (4944 bits), 618 bytes captured (4944 bits)
    Arrival Time: May 31, 2011 22:34:56.581502000 Russian Daylight Time
    Epoch Time: 1306866896.581502000 seconds
    [Time delta from previous captured frame: 0.000778000 seconds]
    [Time delta from previous displayed frame: 17.545861000 seconds]
    [Time since reference or first frame: 43.361290000 seconds]
    Frame Number: 24412
    Frame Length: 618 bytes (4944 bits)
    Capture Length: 618 bytes (4944 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:udp:bootp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: Cisco_81:de:2a (00:17:5a:81:de:2a), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
    Source: Cisco_81:de:2a (00:17:5a:81:de:2a)
        Address: Cisco_81:de:2a (00:17:5a:81:de:2a)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 604
    Identification: 0x2113 (8467)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 255
    Protocol: UDP (17)
    Header checksum: 0x987e [correct]
        [Good: True]
        [Bad: False]
    Source: 0.0.0.0 (0.0.0.0)
    Destination: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 584
    Checksum: 0xf05b [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x00000809
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 0.0.0.0 (0.0.0.0)
    Next server IP address: 0.0.0.0 (0.0.0.0)
    Relay agent IP address: 0.0.0.0 (0.0.0.0)
    Client MAC address: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (t=53,l=1) DHCP Message Type = DHCP Discover
        Option: (53) DHCP Message Type
        Length: 1
        Value: 01
    Option: (t=57,l=2) Maximum DHCP Message Size = 1152
        Option: (57) Maximum DHCP Message Size
        Length: 2
        Value: 0480
    Option: (t=61,l=25) Client identifier
        Option: (61) Client identifier
        Length: 25
        Value: 00636973636f2d303031372e356138312e646532612d566c...
    Option: (t=12,l=9) Host Name = "877w-home"
        Option: (12) Host Name
        Length: 9
        Value: 383737772d686f6d65
    Option: (t=55,l=8) Parameter Request List
        Option: (55) Parameter Request List
        Length: 8
        Value: 01060f2c0321962b
        1 = Subnet Mask
        6 = Domain Name Server
        15 = Domain Name
        44 = NetBIOS over TCP/IP Name Server
        3 = Router
        33 = Static Route
        150 = TFTP server address
        43 = Vendor-Specific Information
    Option: (t=60,l=12) Vendor class identifier = "dslforum.org"
        Option: (60) Vendor class identifier
        Length: 12
        Value: 64736c666f72756d2e6f7267
    End Option
    Padding

No.     Time     Source                Destination           Protocol Info
  24418 22:34:56 10.244.9.26           10.251.0.2            DHCP     DHCP Offer    - Transaction ID 0x809

Frame 24418: 349 bytes on wire (2792 bits), 349 bytes captured (2792 bits)
    Arrival Time: May 31, 2011 22:34:56.592920000 Russian Daylight Time
    Epoch Time: 1306866896.592920000 seconds
    [Time delta from previous captured frame: 0.001908000 seconds]
    [Time delta from previous displayed frame: 0.011418000 seconds]
    [Time since reference or first frame: 43.372708000 seconds]
    Frame Number: 24418
    Frame Length: 349 bytes (2792 bits)
    Capture Length: 349 bytes (2792 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:udp:bootp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: D-Link_f7:c1:c5 (5c:d9:98:f7:c1:c5), Dst: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Destination: Cisco_81:de:2a (00:17:5a:81:de:2a)
        Address: Cisco_81:de:2a (00:17:5a:81:de:2a)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Source: D-Link_f7:c1:c5 (5c:d9:98:f7:c1:c5)
        Address: D-Link_f7:c1:c5 (5c:d9:98:f7:c1:c5)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 10.244.9.26 (10.244.9.26), Dst: 10.251.0.2 (10.251.0.2)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 335
    Identification: 0xc81a (51226)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: UDP (17)
    Header checksum: 0x9279 [correct]
        [Good: True]
        [Bad: False]
    Source: 10.244.9.26 (10.244.9.26)
    Destination: 10.251.0.2 (10.251.0.2)
User Datagram Protocol, Src Port: bootps (67), Dst Port: bootpc (68)
    Source port: bootps (67)
    Destination port: bootpc (68)
    Length: 315
    Checksum: 0xcf97 [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Bootstrap Protocol
    Message type: Boot Reply (2)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 1
    Transaction ID: 0x00000809
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 10.251.0.2 (10.251.0.2)
    Next server IP address: 0.0.0.0 (0.0.0.0)
    Relay agent IP address: 10.244.9.26 (10.244.9.26)
    Client MAC address: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (t=53,l=1) DHCP Message Type = DHCP Offer
        Option: (53) DHCP Message Type
        Length: 1
        Value: 02
    Option: (t=54,l=4) DHCP Server Identifier = 10.251.0.1
        Option: (54) DHCP Server Identifier
        Length: 4
        Value: 0afb0001
    Option: (t=1,l=4) Subnet Mask = 255.255.0.0
        Option: (1) Subnet Mask
        Length: 4
        Value: ffff0000
    Option: (t=61,l=7) Client identifier
        Option: (61) Client identifier
        Length: 7
        Value: 01000000000000
        Hardware type: Ethernet
        Client MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00)
    Option: (t=3,l=4) Router = 10.251.0.1
        Option: (3) Router
        Length: 4
        Value: 0afb0001
    Option: (t=51,l=4) IP Address Lease Time = 15 minutes
        Option: (51) IP Address Lease Time
        Length: 4
        Value: 00000384
    Option: (t=6,l=8) Domain Name Server
        Option: (6) Domain Name Server
        Length: 8
        Value: c362a01a00000000
        IP Address: 195.98.160.26
        IP Address: 0.0.0.0
    End Option
    Padding

No.     Time     Source                Destination           Protocol Info
  26357 22:35:00 0.0.0.0               255.255.255.255       DHCP     DHCP Discover - Transaction ID 0x809

Frame 26357: 618 bytes on wire (4944 bits), 618 bytes captured (4944 bits)
    Arrival Time: May 31, 2011 22:35:00.039904000 Russian Daylight Time
    Epoch Time: 1306866900.039904000 seconds
    [Time delta from previous captured frame: 0.000927000 seconds]
    [Time delta from previous displayed frame: 3.446984000 seconds]
    [Time since reference or first frame: 46.819692000 seconds]
    Frame Number: 26357
    Frame Length: 618 bytes (4944 bits)
    Capture Length: 618 bytes (4944 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:udp:bootp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: Cisco_81:de:2a (00:17:5a:81:de:2a), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
    Source: Cisco_81:de:2a (00:17:5a:81:de:2a)
        Address: Cisco_81:de:2a (00:17:5a:81:de:2a)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 604
    Identification: 0x2116 (8470)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 255
    Protocol: UDP (17)
    Header checksum: 0x987b [correct]
        [Good: True]
        [Bad: False]
    Source: 0.0.0.0 (0.0.0.0)
    Destination: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 584
    Checksum: 0xf05b [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x00000809
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 0.0.0.0 (0.0.0.0)
    Next server IP address: 0.0.0.0 (0.0.0.0)
    Relay agent IP address: 0.0.0.0 (0.0.0.0)
    Client MAC address: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (t=53,l=1) DHCP Message Type = DHCP Discover
        Option: (53) DHCP Message Type
        Length: 1
        Value: 01
    Option: (t=57,l=2) Maximum DHCP Message Size = 1152
        Option: (57) Maximum DHCP Message Size
        Length: 2
        Value: 0480
    Option: (t=61,l=25) Client identifier
        Option: (61) Client identifier
        Length: 25
        Value: 00636973636f2d303031372e356138312e646532612d566c...
    Option: (t=12,l=9) Host Name = "877w-home"
        Option: (12) Host Name
        Length: 9
        Value: 383737772d686f6d65
    Option: (t=55,l=8) Parameter Request List
        Option: (55) Parameter Request List
        Length: 8
        Value: 01060f2c0321962b
        1 = Subnet Mask
        6 = Domain Name Server
        15 = Domain Name
        44 = NetBIOS over TCP/IP Name Server
        3 = Router
        33 = Static Route
        150 = TFTP server address
        43 = Vendor-Specific Information
    Option: (t=60,l=12) Vendor class identifier = "dslforum.org"
        Option: (60) Vendor class identifier
        Length: 12
        Value: 64736c666f72756d2e6f7267
    End Option
    Padding

No.     Time     Source                Destination           Protocol Info
  28607 22:35:04 0.0.0.0               255.255.255.255       DHCP     DHCP Discover - Transaction ID 0x809

Frame 28607: 618 bytes on wire (4944 bits), 618 bytes captured (4944 bits)
    Arrival Time: May 31, 2011 22:35:04.040345000 Russian Daylight Time
    Epoch Time: 1306866904.040345000 seconds
    [Time delta from previous captured frame: 0.001010000 seconds]
    [Time delta from previous displayed frame: 4.000441000 seconds]
    [Time since reference or first frame: 50.820133000 seconds]
    Frame Number: 28607
    Frame Length: 618 bytes (4944 bits)
    Capture Length: 618 bytes (4944 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ip:udp:bootp]
    [Coloring Rule Name: UDP]
    [Coloring Rule String: udp]
Ethernet II, Src: Cisco_81:de:2a (00:17:5a:81:de:2a), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        Address: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
    Source: Cisco_81:de:2a (00:17:5a:81:de:2a)
        Address: Cisco_81:de:2a (00:17:5a:81:de:2a)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
    Type: IP (0x0800)
Internet Protocol, Src: 0.0.0.0 (0.0.0.0), Dst: 255.255.255.255 (255.255.255.255)
    Version: 4
    Header length: 20 bytes
    Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
        0000 00.. = Differentiated Services Codepoint: Default (0x00)
        .... ..0. = ECN-Capable Transport (ECT): 0
        .... ...0 = ECN-CE: 0
    Total Length: 604
    Identification: 0x2118 (8472)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 255
    Protocol: UDP (17)
    Header checksum: 0x9879 [correct]
        [Good: True]
        [Bad: False]
    Source: 0.0.0.0 (0.0.0.0)
    Destination: 255.255.255.255 (255.255.255.255)
User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
    Source port: bootpc (68)
    Destination port: bootps (67)
    Length: 584
    Checksum: 0xf05b [validation disabled]
        [Good Checksum: False]
        [Bad Checksum: False]
Bootstrap Protocol
    Message type: Boot Request (1)
    Hardware type: Ethernet
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x00000809
    Seconds elapsed: 0
    Bootp flags: 0x0000 (Unicast)
        0... .... .... .... = Broadcast flag: Unicast
        .000 0000 0000 0000 = Reserved flags: 0x0000
    Client IP address: 0.0.0.0 (0.0.0.0)
    Your (client) IP address: 0.0.0.0 (0.0.0.0)
    Next server IP address: 0.0.0.0 (0.0.0.0)
    Relay agent IP address: 0.0.0.0 (0.0.0.0)
    Client MAC address: Cisco_81:de:2a (00:17:5a:81:de:2a)
    Client hardware address padding: 00000000000000000000
    Server host name not given
    Boot file name not given
    Magic cookie: DHCP
    Option: (t=53,l=1) DHCP Message Type = DHCP Discover
        Option: (53) DHCP Message Type
        Length: 1
        Value: 01
    Option: (t=57,l=2) Maximum DHCP Message Size = 1152
        Option: (57) Maximum DHCP Message Size
        Length: 2
        Value: 0480
    Option: (t=61,l=25) Client identifier
        Option: (61) Client identifier
        Length: 25
        Value: 00636973636f2d303031372e356138312e646532612d566c...
    Option: (t=12,l=9) Host Name = "877w-home"
        Option: (12) Host Name
        Length: 9
        Value: 383737772d686f6d65
    Option: (t=55,l=8) Parameter Request List
        Option: (55) Parameter Request List
        Length: 8
        Value: 01060f2c0321962b
        1 = Subnet Mask
        6 = Domain Name Server
        15 = Domain Name
        44 = NetBIOS over TCP/IP Name Server
        3 = Router
        33 = Static Route
        150 = TFTP server address
        43 = Vendor-Specific Information
    Option: (t=60,l=12) Vendor class identifier = "dslforum.org"
        Option: (60) Vendor class identifier
        Length: 12
        Value: 64736c666f72756d2e6f7267
    End Option
    Padding

Any ideas?..

paolo bevilacqua · ‎05-31-2011

It happens sometime.

things to try

use an 871 that is proper for ethernet.

configure a dhcp client-id

have spanning-tree portfast under interface.

update IOS.

nathan.murr · ‎05-31-2011

configure a dhcp client-id

Could you please be more specific? I tried setting this option to "Fastethernet 1", so it's MAC appeared as cliend-id in the dhcp debug - nothing changed.

have spanning-tree portfast under interface.

Also tried this...

update IOS.

Tried IOS 15+, as the google said many of those having such an issue confirmed it helps to resolve, but still getting the same error. Maybe it should be a specific release?

use an 871 that is proper for ethernet.

yeah, looks like it's the last hope. But all the idea was to add ISP redundancy to the existing DSL connection

paolo bevilacqua · ‎05-31-2011

I have 877s with DHCP on a 2nd VLAN and they work.

On the other hand I've seen this failing more than once.

Who is giving the Ip address, the Dlink router or the ISP? Because it's not a public address.

Is that a cable connection? If not maybe better to use a 1841 / 1921 with 2 x ADSL cards ?

nathan.murr · ‎05-31-2011

the ISP has DLINK as dhcp server it's not public IP, indeed, but it should be so, it works through NAT somewhere on ISP side.

Since no crucial services are running, we haven't ordered static public IP considering additional charges.

It's a cable connection, standard twisted-pair 100base-tx ethernet.

Could you please specifiy the IOS version of your 877 where such configuration works?

nathan.murr · ‎06-01-2011

figured it out with the following settings:

no ip dhcp-client broadcast-flag
!
interface Vlan3
 ip dhcp relay information trusted
 ip dhcp relay information check-reply none
 no ip dhcp client request tftp-server-address
 no ip dhcp client request netbios-nameserver
 no ip dhcp client request vendor-specific
 no ip dhcp client request static-route
 ip address dhcp
 ip nat outside
 ip virtual-reassembly
end

same IOS (12.4T). Thanks everyone!

paolo bevilacqua · ‎06-02-2011

Thank you for posting this informatiom.

I wonder what it was the information the router did not liked, and why no debug output was printed !

nathan.murr · ‎06-02-2011

my assumption that the router did not like the dhcp offer because of ISP's dhcp relay. That is, the source MAC of the frame with DHCP OFFER (closest ISP's switch) differs from actual dhcp source. Debugs are weird, thats true...

paolo bevilacqua · ‎06-03-2011

I've looked at the traces and cannot find anything wrong with them. There is no MAC for DHCP source in a OFFER packet.

Again what I find very wrong is that there is no debug output when receiving the offer.