10-27-2008 10:40 AM - edited 03-06-2019 02:09 AM
Hello guys,
I have a Cisco 2811 router that is sending out DHCP discovery packets.
The only dhcp related line in the config is the 'no dhcp service' command, there is no dhcp command under any interface command.
Do you know how can I turn off this ?
router2811#debug dhcp detail
Oct 27 09:57:36.198 EDT: DHCP: DHCP client process started: 10
Oct 27 09:57:36.198 EDT: DHCP: proxy allocate request
Oct 27 09:57:36.198 EDT: DHCP: new entry. add to queue, interface
Oct 27 09:57:36.198 EDT: DHCP: SDiscover attempt # 1 for entry:
Oct 27 09:57:36.198 EDT: Temp IP addr: 0.0.0.0 for peer on Interface: unknown
Oct 27 09:57:36.198 EDT: Temp sub net mask: 0.0.0.0
Oct 27 09:57:36.198 EDT: DHCP Lease server: 0.0.0.0, state: 1 Selecting
Oct 27 09:57:36.198 EDT: DHCP transaction id: 16B9
Oct 27 09:57:36.198 EDT: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs
Oct 27 09:57:36.198 EDT: Next timer fires after: 00:00:04
Oct 27 09:57:36.198 EDT: Retry count: 1 Client-ID: saa-23679,80444
Oct 27 09:57:36.198 EDT: Client-ID hex dump: 73blablalbla33637392C3830343434
Oct 27 09:57:36.198 EDT: Hostname: router2811
Oct 27 09:57:36.198 EDT: DHCP: SDiscover: sending 283 byte length DHCP packet
Oct 27 09:57:36.198 EDT: DHCP: SDiscover 283 bytes
Oct 27 09:57:36.198 EDT: B'cast on FastEthernet0/0.351 interface from 10.0.168.10
Oct 27 09:57:36.198 EDT: B'cast on FastEthernet0/0.352 interface from 10.0.160.10
router2811#sh runn | include dhcp
no service dhcp
router2811#
Thanks,
Daniel
10-27-2008 12:11 PM
Are you using a helper command on interface 0.351 and 0.352?
--John
10-28-2008 03:56 AM
Hi John,
No, I'm not using ip helper.
These are the configs of the interfaces:
interface FastEthernet0/0.351
description subnet10.0.168.0/21-vlan351
encapsulation dot1Q 351 native
ip address 10.0.168.10 255.255.248.0
ip access-group xyz in
no ip redirects
no ip unreachables
no ip proxy-arp
no snmp trap link-status
arp timeout 420
service-policy output xyz_voip
end
*
interface FastEthernet0/0.352
description subnet10.0.160.0/25-vlan352
encapsulation dot1Q 352
ip address 10.0.160.10 255.255.255.128
ip access-group xyz in
no ip redirects
no ip unreachables
no ip proxy-arp
no snmp trap link-status
arp timeout 420
service-policy output xyz_voip
end
Thanks,
Daniel
10-28-2008 06:34 AM
If you have no need for any dhcp, you could run no ip bootp server and see if that helps. It's a global command.
--John
10-28-2008 09:01 AM
Daniel
are any of the interfaces configured with ip address negotiated? This would initiate DHCP.
Perhaps it would be helpful if you would post the confiuration of all of the interfaces?
HTH
Rick
10-28-2008 10:18 AM
John,
The 'no ip bootp server' was already there.
Rick,
the 2 subinterfaces are configured with static ip addresses and the interface Fast0/0 has the 'no ip address' command. There is no interface configured to obtain the ip in negotiation mode.
A friend of mine suggested to add and remove an 'ip address x y' on the Fast0/0 interface to kinda refresh it, I just did that but it didn't not work.
Thanks,
Daniel
10-28-2008 10:25 AM
Daniel,
At this point it might benefit you more if you could post your config.
Thanks,
John
11-03-2008 08:47 AM
I got it:
debug ip sla trace
Nov 1 14:03:36.754 EDT: IP SLAs(23679) dhcp operation: Starting dhcp operation
Nov 1 14:03:37.394 EDT: IP SLAs(23679) dhcp operation: request gave address 10.2.173.14 255.255.248.0 in 639 ms
Nov 1 14:04:36.756 EDT: IP SLAs(23679) dhcp operation: Starting dhcp operation
Nov 1 14:04:37.396 EDT: IP SLAs(23679) dhcp operation: request gave address 10.2.173.14 255.255.248.0 in 639 ms
Nov 1 14:05:36.758 EDT: IP SLAs(23679) dhcp operation: Starting dhcp operation
Nov 1 14:05:37.398 EDT: IP SLAs(23679) dhcp operation: request gave address 10.2.173.14 255.255.248.0 in 639 ms
Thank you all.
Daniel
11-03-2008 10:04 AM
Daniel
I am glad that you figured it out. IP SLA is a pretty obscure thing to initiate DHCP. Thank you for posting back to the thread indicating that you had solved it and what the solution was. It helps make the forum more useful when people can read about a problem and can read the solution to the problem.
HTH
Rick
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