We have access points running with different firmware versions.
We added an additional subnet to our router and DHCP pool -- one subnet each for two different locations.
In location #1, the firmware of the APs is 2.4.3 and has no bridge table data.
In location #2, the firmware of the APs is 2.6.2 and has bridge table data.
When adding an additional subnet to location #1, we had no problems with routers behind SMs renewing IP addresses.
In location #2, I see DISCOVERS and the server OFFERS but get no requests from the remote. Eventually customers in location #2 go off-line. If we connect a laptop direct, DHCP messages get relayed. If we swap out a router, DHCP messages get relayed.
The major difference with DHCP that I can see is that the new subnet is the lowest IP and is chosen by the router to relay the transactions to the server. And this seems to be a problem with location #2.
Is there a troubleshooting mechanism that we can use for this problem or is this a bug fixed by a later firmware release?
If we need to turn off the bridge table on the 2.6.2 devices, where is that option?
The "no bridge table data" is a reporting issue, it has nothing to do with your DHCP issue. If you want to eliminate the 2.6.2 firmware as the culprit, downgrade those radios to 2.4.3 and see if it resolves your issue. Also, as was suggested make sure the "DHCP Server Below SM" is enabled, if indeed your DHCP server is below the SM.