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DHCP Binding list Empty - Users receive IP from router.

Elton Babcock
Level 1
Level 1

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

Sent from Cisco Technical Support iPhone App

14 Replies 14

InayathUlla Sharieff
Cisco Employee
Cisco Employee

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.

Hello,

Is dhcp enabled on the router?
Is the pc client interface setup for dhcp?
can you post the routers config

res

Paul

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Kind Regards
Paul

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=&myip=

>

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

Hello,

can you apply:

831

clear ip dhcp binding *
debug ip dhcp server packet

Client pc

ipconfig /release

ipconfig /renew

res

Paul

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Kind Regards
Paul

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

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.


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

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

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

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.


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

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

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".

You should try to upgrade IOS that might help.

Jawad

Elton Babcock
Level 1
Level 1

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

Hello,

Have you tried:

  • Reloading the router?
  • Change path of the dhcp database? - ip dhcp database (nvram | flash:dhcp-binding)

res

Paul

Please don't forget to rate this post if it has been helpful.


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul
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