11-11-2013 01:10 AM - edited 07-04-2021 01:14 AM
I'm stock with a 2504 using version 7.0.220.0 that won't lease out DHCP adresses
Wifi clients are unable to get a DHCP lease from an external DHCP server.
The WLC are handling 3 WLAN, 2 using internal DHCP server, 1 (that wont work) using external DHCP. The external DHCP server, is a router/firewall (out of my reach) that suffered from a power out, a short while ago, ever since the DHCP is not working on that VLAN, if client are getting static ip adresses, everything works fine. If i'm using the same network link, and plug it into a computer, I get a DHCP address.
I've enable DHCP proxy
Debbuging DHCP, using: Debug DHCP packets enable
Gives me this:
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP received op BOOTREQUEST (1) (len 308,vlan 20, port 1, encap 0xec00)
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP option len (including the magic cookie) 72
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP option: message type = DHCP INFORM
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP option: 61 (len 7) - skipping
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP option: 12 (len 1) - skipping
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP option: vendor class id = MSFT 5.0 (len
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP option: 55 (len 13) - skipping
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP options end, len 72, actual 64
*DHCP Socket Task: Nov 08 14:21:11.397: c8:0a:a9:cc:6d:f6 DHCP dropping packet (no mscb) found - (giaddr 0.0.0.0, pktInfo->srcPort 68, op: 'BOOTREQUEST')
Thanks
Solved! Go to Solution.
11-11-2013 02:29 AM
Hi Steen,
When a client is in DHCP REQ state on the controller, the controller drops DHCP inform packets. The client will not go into a RUN state on the controller (this is required for the client to pass traffic) until it receives a DHCP discover packet from the client. DHCP inform packets are forwarded by the controller when DHCP proxy is disabled.
Please check this, if still u r facing issue then provide more info.
Can you please paste a client debug of the client having DHCP issues.
Go to cli of the wlc and run the client debug
Regards
11-11-2013 02:29 AM
Hi Steen,
When a client is in DHCP REQ state on the controller, the controller drops DHCP inform packets. The client will not go into a RUN state on the controller (this is required for the client to pass traffic) until it receives a DHCP discover packet from the client. DHCP inform packets are forwarded by the controller when DHCP proxy is disabled.
Please check this, if still u r facing issue then provide more info.
Can you please paste a client debug of the client having DHCP issues.
Go to cli of the wlc and run the client debug
Regards
11-12-2013 12:07 AM
This solved the issue.
Thank you so much...
06-05-2017 11:53 AM
Hi,
Can you explain how did you resolved the problem, because i'm facing the same issue.
Thanks.
06-05-2017 01:02 PM
I believe the issue was that the setting for DHCP proxy was enabled, and disabling it resolved his issues.
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