09-28-2011 11:29 PM - edited 03-07-2019 02:30 AM
Hi ,
DHCP relay not working in switch WS-C3560G-24PS
image details -
c3560-ipservicesk9-mz.122-55.SE.bin
its working if i keep DHCP server in same vlan as user ., wireshark says DHCP offer packets are currupted and there is no client ip (0.0.0.0 0.0.0.0 ) .
Thanks 4 reply
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09-29-2011 12:57 AM
Hi,
Could you post the wireshark capture file filtering only DHCP.
Provide sh run | s dhcp.
Also do a debug ip dhcp server events and debug ip dhcp server packets on the switch doing relay.
Regards.
Alain.
09-29-2011 01:45 AM
Hi saqar,
i hope u hv configured "ip helper-address" in all other vlan interfaces.
Thx
shehin.pm
09-29-2011 06:38 AM
Hi Alain ,
Here is the capture attached .
Thanks 4 reply
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09-29-2011 06:54 AM
Hi,
I was talking about the modified pcap showing only dhcp not a screenshot.
Can you also picture your topology with HSRP, DHCP server, DHCP pools and provide output of sh run | be dhcp on the switch.
Where was the capture taken? where is located DHCP server, is it router, w2k3,linux?
Regards.
Alain.
09-29-2011 07:19 AM
Hi Alain ,
This is windows server , switch 3560 acting as relay .Before switch was working as IOS DHCP and now I want it to configure as relay agent only .
In same vlan its working fine but on diff vlans its not .
I m not able to attach wireshark capture here , not able to find option what most i can say DHCP offer packet is currupt with 0.0.0.0 in client address .
please let me know if any thing you can suggest me .
Thanks 4 reply
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09-29-2011 07:40 AM
Hi,
provide a picture of topology and post running of the 3560 .
Just use the attached file at the bottom of window to attach pcap file.
Regards.
Alain.
09-29-2011 11:13 AM
09-29-2011 11:17 AM
foget to add - full config I m not able to past here but here is the vlan for which i did wireshark capture -
!
interface Vlan100
description <<< A_Corp >>>
ip vrf forwarding A_VRF
ip address 10.107.170.2 255.255.255.192
ip access-group A_Corp in
ip helper-address 10.107.170.228
no ip redirects
no ip unreachables
no ip proxy-arp
standby 100 ip 10.107.170.1
standby 100 timers 5 10
standby 100 preempt
standby 100 authentication md5 key-string 7 052D423960666E3039
!
09-29-2011 01:32 PM
Hi,
I've never configured DHCP relay agent with vrf so I'll lab it up to see if this is the vrf which may be causing the problem.
Regards.
Alain
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