02-28-2013 01:18 PM - edited 03-07-2019 11:59 AM
I have a Cisco 831 router which I have setup for my father and I am seeing some weird behavior in regard to the DHCP binding entries. There are not even though his PC has clearly obtained an address from the router.
I have bounced the physical port a PC is connected to and still nothing shows up. I have cleared the DHCP bindings and nothing shows up.
Has anyone else seen this or know how to resolve it?
Thanks, Elton
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03-01-2013 02:56 AM
Hi elton,
This shouldnt be. Kindly check if there are any other DHCP configuration on the Device.
http://www.cisco.com/en/US/docs/ios/12_0t/12_0t1/feature/guide/Easyip2.html
Regards
Inayath.
03-01-2013 03:18 AM
Hello,
Is dhcp enabled on the router?
Is the pc client interface setup for dhcp?
can you post the routers config
res
Paul
Please don't forget to rate this post if it has been helpful.
03-01-2013 04:55 AM
Here is the routers config. The PC clearly recieved an IP from this router as I sent this router out and it was hooked up with different IP settings than the previous router. I logged into the PC via VNC and was able to see the new DHCP settings obtained from this router. Please let me know if you have any suggestions. I really like being able to see these bindings as this is a remote router and it can help me find an IP of a device plugged in.
Thanks, Elton
version 12.4
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec
service timestamps log datetime msec localtime
service password-encryption
!
hostname DAD-ROUTER-831
!
boot-start-marker
boot system flash:c831-k9o3sy6-mz.124-25d.bin
boot-end-marker
!
logging buffered 16384 informational
enable secret 5 $1$AuUo$mL1WBD0H.5yN7l1Mu5w0l1
!
aaa new-model
!
!
aaa authentication login default local
aaa authorization console
aaa authorization exec default local
!
aaa session-id common
clock timezone EST -5
no ip source-route
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.1.1 192.168.1.4
ip dhcp excluded-address 192.168.1.6 192.168.1.10
ip dhcp excluded-address 192.168.1.244 192.168.1.254
!
ip dhcp pool DAD_LAN_192.168.1.0/24
network 192.168.1.0 255.255.255.0
domain-name babcock.home
default-router 192.168.1.254
dns-server 8.8.8.8 8.8.4.4
lease 7
!
!
ip cef
ip domain name babcock.home
ip name-server 8.8.8.8
ip name-server 8.8.4.4
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
ip ddns update method DYNDNS
HTTP
add
http://***********:**************@members.dyndns.org/nic/update?system=dyndns&hostname=
>
interval maximum 7 0 0 0
!
!
!
!
username ************ privilege 15 password 7 ***********************
!
!
ip tftp source-interface Loopback0
ip ssh version 2
!
!
crypto isakmp policy 1
encr 3des
authentication pre-share
group 5
crypto isakmp key ********** address ***************
!
!
crypto ipsec transform-set VPN_TSET esp-3des esp-sha-hmac
!
crypto map VPN_MAP 1 ipsec-isakmp
set peer *****************
set security-association lifetime seconds 86400
set transform-set VPN_TSET
set pfs group5
match address VPN_TRAFFIC
!
!
!
interface Loopback0
ip address 192.168.0.1 255.255.255.255
!
interface Ethernet0
description LAN INTERFACE
ip address 192.168.1.254 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nbar protocol-discovery
ip nat inside
ip virtual-reassembly
load-interval 60
!
interface Ethernet1
description CONNECTION TO ISP
ip ddns update hostname *****************
ip ddns update DYNDNS
ip address dhcp
no ip redirects
no ip unreachables
no ip proxy-arp
ip nbar protocol-discovery
ip nat outside
ip virtual-reassembly
load-interval 60
duplex auto
no cdp enable
crypto map VPN_MAP
!
interface Ethernet2
no ip address
shutdown
!
interface FastEthernet1
duplex auto
speed auto
!
interface FastEthernet2
duplex auto
speed auto
!
interface FastEthernet3
duplex auto
speed auto
!
interface FastEthernet4
duplex auto
speed auto
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip nat inside source list FOR_NAT interface Ethernet1 overload
!
!
ip access-list extended FOR_NAT
deny ip 192.168.1.0 0.0.0.255 172.16.3.0 0.0.0.255
deny ip host 192.168.0.1 172.16.3.0 0.0.0.255
permit ip 192.168.1.0 0.0.0.255 any
ip access-list extended VPN_TRAFFIC
permit ip 192.168.0.0 0.0.1.255 172.16.3.0 0.0.0.255
!
!
!
control-plane
!
banner login ^C
***********************************************************************
Unauthorized use of this machine is prohibited.
This is a private machine intended for private purposes.
The private party reserves the right to monitor its use as necessary
to ensure its stability, availability, and security.
**********************************************************************^C
alias exec traffic show ip nbar protocol-discovery stats bit-rate top-n 10
!
line con 0
exec-timeout 15 0
password 7 *******************
logging synchronous
no modem enable
line aux 0
exec-timeout 15 0
logging synchronous
line vty 0 4
exec-timeout 15 0
password 7 ****************
logging synchronous
transport input ssh
!
scheduler max-task-time 5000
ntp clock-period 17179656
ntp source Ethernet1
ntp server 64.90.182.55
ntp server 96.47.67.105
ntp server 165.193.126.229
end
03-01-2013 05:47 AM
Hello,
can you apply:
831
clear ip dhcp binding *
debug ip dhcp server packet
Client pc
ipconfig /release
ipconfig /renew
res
Paul
Please don't forget to rate this post if it has been helpful.
03-01-2013 06:07 AM
Please see this output. This is showing when the desktop boots up. I previously cleared the dhcp bindings and then the PC started to boot.
DAD-ROUTER-831#
Mar 1 09:02:47.802: %LINK-3-UPDOWN: Interface FastEthernet4, changed state to up
Mar 1 09:02:47.802: %LINK-3-UPDOWN: Interface Ethernet0, changed state to up
Mar 1 09:02:48.802: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet4, changed state to up
Mar 1 09:02:48.802: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to up
DAD-ROUTER-831#
Mar 1 14:03:26.073: DHCPD: DHCPREQUEST received from client 0100.1320.d71f.ce.
Mar 1 14:03:26.073: DHCPD: Finding a relay for client 0100.1320.d71f.ce on interface Ethernet0.
Mar 1 14:03:26.073: DHCPD: Seeing if there is an internally specified pool class:
Mar 1 14:03:26.073: DHCPD: htype 1 chaddr 0013.20d7.1fce
Mar 1 14:03:26.073: DHCPD: remote id 020a0000c0a801feff000000
Mar 1 14:03:26.073: DHCPD: circuit id 00000000
DAD-ROUTER-831#
Mar 1 14:03:31.053: DHCPD: DHCPREQUEST received from client 0100.1320.d71f.ce.
Mar 1 14:03:31.053: DHCPD: Finding a relay for client 0100.1320.d71f.ce on interface Ethernet0.
Mar 1 14:03:31.057: DHCPD: Seeing if there is an internally specified pool class:
Mar 1 14:03:31.057: DHCPD: htype 1 chaddr 0013.20d7.1fce
Mar 1 14:03:31.057: DHCPD: remote id 020a0000c0a801feff000000
Mar 1 14:03:31.057: DHCPD: circuit id 00000000
DAD-ROUTER-831#
Mar 1 14:03:39.069: DHCPD: DHCPREQUEST received from client 0100.1320.d71f.ce.
Mar 1 14:03:39.069: DHCPD: Finding a relay for client 0100.1320.d71f.ce on interface Ethernet0.
Mar 1 14:03:39.069: DHCPD: Seeing if there is an internally specified pool class:
Mar 1 14:03:39.069: DHCPD: htype 1 chaddr 0013.20d7.1fce
Mar 1 14:03:39.069: DHCPD: remote id 020a0000c0a801feff000000
Mar 1 14:03:39.073: DHCPD: circuit id 00000000
DAD-ROUTER-831#
Mar 1 14:04:21.801: DHCPD: checking for expired leases.
Mar 1 14:04:22.773: DHCPD: DHCPINFORM received from client 0100.1320.d71f.ce (192.168.1.11).
Mar 1 14:04:22.773: DHCPD: Sending DHCPACK to client 0100.1320.d71f.ce (192.168.1.11).
Mar 1 14:04:22.773: DHCPD: unicasting BOOTREPLY to client 0013.20d7.1fce (192.168.1.11).
DAD-ROUTER-831#ping 192.168.1.11
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.11, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
DAD-ROUTER-831#show ip dh
DAD-ROUTER-831#show ip dhcp bind
DAD-ROUTER-831#show ip dhcp binding
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
Hardware address/
User name
03-01-2013 06:29 AM
Hello,
sh ip arp 192.168.1.11
sh arp
Also save the routers config and reload it
res
Paul
Please don't forget to rate this post if it has been helpful.
03-01-2013 06:33 AM
Hi Elton,
Please assign a static address to the PC and then ping the 192.168.1.254 and see if you can ping.
thanks
192.168.1.254#sthash.aIpXPIBg.dpuf
192.168.1.254#sthash.aIpXPIBg.dpuf
03-01-2013 06:41 AM
Here is t he output of sh arp: As you can see the mac address is the same as what had requested the IP in the first place.
DAD-ROUTER-831#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.1.11 0 0013.20d7.1fce ARPA Ethernet0
Internet *************** - 0012.8032.b965 ARPA Ethernet1
Internet 192.168.1.254 - 0012.8032.b964 ARPA Ethernet0
Internet *************** 0 0007.7d8d.e6d9 ARPA Ethernet1
The machine is remote at this time and I don't have VNC access currently. I can't see how giving the machine a static IP on the same subnet would cause the device to not ping 192.168.1.254.
Any other suggestions on this?
I also did a sh ip dhcp pool:
DAD-ROUTER-831#show ip dhcp pool
Pool DAD_LAN_192.168.1.0/24 :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 254
Leased addresses : 0
Pending event : none
1 subnet is currently in the pool :
Current index IP address range Leased addresses
192.168.1.1 192.168.1.1 - 192.168.1.254 0
03-01-2013 06:56 AM
Hello,
The ip address is assigned, the arp table is populated, and connectivity is okay! - but no binding entry?
Is it possible to reload this router?
Also for testing is it also possbile to disable any software fw on the client?
res
Paul
Please don't forget to rate this post if it has been helpful.
03-01-2013 07:02 AM
Hi Elton,
Alright, lets clear what is that you are trying to achieve.
Are you excepting your VPN client receives an IP address from the DHCP pool ?
Or do you except a DHCP client behind the "interface Ethernet0" receives an IP address from DHCP pool: DAD_LAN_192.168.1.0/24 ?
Please answer above.
Thanks
Rizwan Rafeek
03-01-2013 07:07 AM
I am just trying to get the a DHCP client to recieve an IP behind Ethernet0. The PC is clearly recieving the IP from the router as I can see this on the Windows machine.
I would just like to see the information when I issue "show ip dhcp bindings".
03-01-2013 03:14 PM
You should try to upgrade IOS that might help.
03-01-2013 07:10 PM
I have considered changing the IOS version on the router. This version is the latest IOS for this router that Cisco offers.
Has anyone seen this in the version of IOS I am running? 12.4-25d
Elton
Sent from Cisco Technical Support iPhone App
03-03-2013 07:30 AM
Hello,
Have you tried:
res
Paul
Please don't forget to rate this post if it has been helpful.
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