Cisco Router not serving DHCP packets

[ALInux]

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


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[burtsbees]

Post a sh run...

Burt

 

[ALInux]

ip dhcp excluded-address 192.168.0.46
ip dhcp excluded-address 192.168.0.47
ip dhcp excluded-address 192.168.0.48
ip dhcp excluded-address 192.168.0.49
ip dhcp excluded-address 192.168.0.50
ip dhcp ping packets 10
!
ip dhcp pool centrale
network 192.168.0.0 255.255.255.0
default-router 192.168.0.1
dns-server 198.6.1.5 4.2.2.2
netbios-name-server 192.168.0.31
lease infinite
!
!
ip flow-cache timeout active 1

 

[burtsbees]

I wanted to see more, like if you have ip classless, what routing protocol (if any), ip subnet-zero, etc---these could all affect your particular scenario...

Burt

 

[ALInux]

This is the router config..with access lists some traffic shapping removed

Current configuration : 74621 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname CME-Router
!
boot-start-marker
boot system flash 2800nm-advipservicesk9-mz.124-17b.bin
warm-reboot
boot-end-marker
!
!
aaa new-model
!
!
aaa authentication login user local
aaa authentication login sdm_vpn_xauth_ml_1 local
aaa authorization network user1 local
aaa authorization network sdm_vpn_group_ml_1 local
!
aaa session-id common
ip wccp web-cache redirect-list 198
ip wccp 80 redirect-list 198
ip wccp 90 redirect-list 198
!
!
ip cef
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.0.48
ip dhcp excluded-address 192.168.0.49
ip dhcp excluded-address 192.168.0.50
ip dhcp ping packets 10
!
ip dhcp pool centrale
network xxxxxxxxxxxxxxxxx
default-router 1xxxxxxxxxxx
dns-server xxxxxxxxxxxxx
netbios-name-server xxxxxxxxxxxxx
lease infinite
!
!
ip flow-cache timeout active 1
ip name-server xxxxxxxxxxx
ip name-server xxxxxxxxxxxxxxxx
ip sla monitor 1
type echo protocol ipIcmpEcho xxxxxxxxxxxxxxxx
frequency 30
ip sla monitor schedule 1 life forever start-time now
ip sla monitor 2
type echo protocol ipIcmpEcho xxxxxxxxxxxxxxxx
frequency 30
ip sla monitor schedule 2 life forever start-time now
ip sla monitor 3
type echo protocol ipIcmpEcho xxxxxxxxxxxxxxx
frequency 30
ip sla monitor schedule 3 life forever start-time now
ip sla monitor 4
type echo protocol ipIcmpEcho xxxxxxxxxxxxxx
frequency 30
ip sla monitor schedule 4 life forever start-time now
!
archive
log config
logging enable
notify syslog
!
!
!

!
!
!
!
interface Loopback0
no ip address
!
interface FastEthernet0/0
description xxxxxxxxxxxx$ETH-WAN$
ip address xxxxxxxxxxxxxxxxxxxxx
ip nat outside
no ip virtual-reassembly
ip route-cache flow
load-interval 30
duplex auto
speed auto
!
interface FastEthernet0/1
description LAN-Interface$ETH-LAN$
ip address xxxxxxxxxxxxxxx
ip address xxxxxxxxxxxxx
ip address xxxxxxxxxxxxxx
ip address xxxxxxxxxxxxxx
ip address xxxxxxxxxxxxxx
ip access-group 113 in
ip accounting access-violations
ip wccp 80 redirect in
ip nat inside
ip virtual-reassembly

ip route-cache same-interface
ip route-cache flow
ip policy route-map xxxxxxx
load-interval 30
duplex auto
speed auto
arp probe interval 10 count 1
service-policy output voice-in
!
interface FastEthernet0/2/0
description xxxxxxxx
load-interval 30
spanning-tree portfast
!
interface FastEthernet0/2/1
!
interface FastEthernet0/2/2
!
interface FastEthernet0/2/3
switchport mode trunk
spanning-tree portfast
!
interface Vlan1
description MW-IDM
ip address xxxxxxxxxxxxxxxxxxxxxxxxxxx
ip wccp 90 redirect out
ip nat outside
ip virtual-reassembly
ip route-cache flow
load-interval 30
crypto map clientmap
service-policy output voice-out
!
interface Vlan11
no ip address
!
interface Dialer1
no ip address
no ip mroute-cache
!
ip local pool ippool xxxx xxxxxxxxxxxxx
ip forward-protocol nd

!
ip flow-export source FastEthernet0/1
ip flow-export version 5 peer-as
ip flow-export destination xxxxxxxxxxxxxxxx 9996
ip flow-export destination xxxxxxxxxx 9996
ip flow-top-talkers
top 20
sort-by bytes
cache-timeout 10
!
!
route-map xxx permit 10
match ip address 111
set ip next-hop verify-availability xxxxxxxxxxx 1 track 100
set ip next-hop verify-availability xxxxxxxxxxxx 2 track 101
!
route-map xxx permit 20
match ip address 112
set ip next-hop verify-availability xxxxxxxxxx 1 track 101
set ip next-hop verify-availability xxxxxxxxxxxxx 2 track 100
!
route-map proxy-redirect permit 10
match ip address 110
set ip next-hopxxxxxxxxxxxx
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!

!

!
scheduler allocate 20000 1000
!
event manager applet CLIAccounting
event cli pattern ".*" sync no skip no
action 1.0 syslog priority informational msg "$_cli_msg"
set 2.0 _exit_status 1
!
end