Cisco router randomly not serving DHCP responses

Unanswered Question
Apr 17th, 2009

Hi

I got a Cisco router, it is also the DHCP server of my network the detail are below.

For some reason the server randomly stops serving IPs to workstations, even a repair conection does not work. Some computers have a valid IP but it does not get renewed.

Router#show version

Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(17b)

, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2008 by Cisco Systems, Inc.

Compiled Tue 26-Feb-08 01:46 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)

I did enable debug and I got :

Adding to the above I got the following debug info...as you can see below the mac address 0016.d490.8e9a is trying to get an IP but it is getting the answer..DHCPD: Allocate an address without class information while 0100.40f4.9689 got 192.168.0.204

Router#

*Apr 16 14:36:43.375: DHCPD: DHCPDISCOVER received from client 0016.d490.8e9a on

interface FastEthernet0/1.

*Apr 16 14:36:43.375: DHCPD: Allocate an address without class information (192.

168.0.0)

*Apr 16 14:36:43.647: %HA_EM-6-LOG: CLIAccounting: terminal monitor

*Apr 16 14:37:00.535: DHCPD: DHCPDISCOVER received from client 0016.d490.8e9a on

interface FastEthernet0/1.

*Apr 16 14:37:00.535: DHCPD: Allocate an address without class information (192.

168.0.0)

*Apr 16 14:37:05.375: DHCPD: DHCPDISCOVER received from client 0016.d490.8e9a on

interface FastEthernet0/1.

*Apr 16 14:37:05.379: DHCPD: Allocate an address without class information (192.

168.0.0)

*Apr 16 14:37:16.375: DHCPD: DHCPDISCOVER received from client 0016.d490.8e9a on

interface FastEthernet0/1.

*Apr 16 14:37:16.375: DHCPD: Allocate an address without class information (192.

168.0.0)

*Apr 16 14:37:29.375: DHCPD: DHCPDISCOVER received from client 0016.d490.8e9a on

interface FastEthernet0/1.

*Apr 16 14:37:29.379: DHCPD: Allocate an address without class information (192.

168.0.0)

*Apr 16 14:37:42.375: DHCPD: DHCPDISCOVER received from client 0016.d490.8e9a on

interface FastEthernet0/1.

*Apr 16 14:37:42.375: DHCPD: Allocate an address without class information (192.

168.0.0)

*Apr 16 14:37:43.551: DHCPD: DHCPINFORM received from client 0100.40f4.9689.ec (

192.168.0.204).

*Apr 16 14:37:43.551: DHCPD: Sending DHCPACK to client 0100.40f4.9689.ec (192.16

8.0.204).

*Apr 16 14:37:43.551: DHCPD: unicasting BOOTREPLY to client 0040.f496.89ec (192.

168.0.204).

*Apr 16 14:37:46.555: DHCPD: DHCPINFORM received from client 0100.40f4.9689.ec (

192.168.0.204).

*Apr 16 14:37:46.555: DHCPD: Sending DHCPACK to client 0100.40f4.9689.ec (192.16

8.0.204).

*Apr 16 14:37:46.555: DHCPD: unicasting BOOTREPLY to client 0040.f496.89ec (192.

168.0.204).

*Apr 16 14:38:00.371: DHCPD: DHCPDISCOVER received from client 0016.d490.8e9a on

interface FastEthernet0/1.

*Apr 16 14:38:00.371: DHCPD: Allocate an address without class information (192.

168.0.0)

*Apr 16 14:38:07.115: DHCPD: DHCPINFORM received from client 0100.1676.6d3b.5e (

192.168.0.182).

*Apr 16 14:38:07.115: DHCPD: Sending DHCPACK to client 0100.1676.6d3b.5e (192.16

8.0.182).

*Apr 16 14:38:07.115: DHCPD: unicasting BOOTREPLY to client 0016.766d.3b5e (192.

168.0.182).

*Apr 16 14:38:10.115: DHCPD: DHCPINFORM received from client 0100.1676.6d3b.5e (

192.168.0.182).

*Apr 16 14:38:10.115: DHCPD: Sending DHCPACK to client 0100.1676.6d3b.5e (192.16

8.0.182).

*Apr 16 14:38:10.115: DHCPD: unicasting BOOTREPLY to client 0016.766d.3b5e (192.

168.0.182).

Please advice. The pool is:

#show ip dhcp pool

Pool centrale :

Utilization mark (high/low) : 100 / 0

Subnet size (first/next) : 0 / 0

Total addresses : 254

Leased addresses : 143

Pending event : none

1 subnet is currently in the pool :

Current index IP address range Leased addr

0.0.0.0 192.168.0.1 - 192.168.0.254 143

http://pastebin.com/mc416229

I have this problem too.
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John Blakley Fri, 04/17/2009 - 06:45

What does your actual dhcp scope look like?

Can you paste the section "ip dhcp pool "?

HTH,

John

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