Wednesday, 24 July 2013

"No option 125" error from Cisco DHCP server

Problem : "No option 125" error was continuosly repeating and DHCP Server on Cisco was not offering any IP address to the clients.
 =========================================
Jul 24 05:36:21.147: DHCPD: No option 125
Jul 24 05:36:21.147: DHCPD: DHCPDISCOVER received from client 001e.e5dc.ae.c0 on interface GigabitEthernet0/1.
Jul 24 05:36:30.707: DHCPD: client's VPN is .
Jul 24 05:36:30.707: DHCPD: No option 125
 ========================================
Solution: After some debugging, came to know that the problem is with the subnet configured on the Gigabit ethernet. For DHCP Server to offer the ipa ddress atleast one interface should be in the same network as the pool is defined. Once the subnet is properly configured, the Server started replying.
The basic config file  for configuring DHCP SERVER on Cisco router
service dhcp
no ip dhcp conflict logging
!
ip dhcp pool 1
 network 11.0.0.0 255.0.0.0
 default-router 11.0.0.1
!
interface GigabitEthernet0/1
 ip address 11.0.0.1 255.0.0.0

1 comment:

  1. There might be many people searching a solution to this problem, what you describe is correct, but most of times, the configuration would seem correct but still you would see no option 125. to correct this, please check the conflict table, 'sho ip dhcp conflict' and then clear ALL conflicts 'clear ip dhcp conflict *'

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