Hello Experts -
We recently replaced our Call Manager servers, jumping from 4.1 to 7.1 after successfully running DMA backup/restore.
Most everything is working fine except when I've had to add a new ip phone to our system. The problem is that it cannot receive a DHCP ip address from the server.
I've checked all the settings that I can possibly find and everything looks like it is configured correctly. If I manually assign an ip to a phone (we are using mostly 7940's and 7960's), then the phone will boot and register fine and works like it should after flashing its image and getting the correct load and firmware.
Rebooting an existing phone in our environment (phones that were online when we had CM 4.1) will boot up more slowly, but it will finish and come online, so apparently it is caching that info from before.
The problem is with a new phone and the only way for me to get it to work is to manually assign the ip. No other changes were made to our environment, so I don't think it would be useful to try to capture any switch packets. I'm wondering if there is something I've missed with our DHCP setup.
Any advice would be appreciated. My TAC engineer basically gave up on me :-(
You are correct, it should be 10.0.0.0. Hopefully changing this and then restarting the DHCP monitor service will get this working.
Hmmm... can't believe we all missed that one!
Well - maybe I'm still being a bit slow, but shouldn't the IPV4 Subnet Address be 10.0.0.0? Since the subnet mask is 255.255.0.0, the address 10.0.1.0 is actually a valid host address, not the subnet address.
I suspect the input validation on this config page is either not good or doesn't exist, but the back-end DHCPD service will be rejecting the config.
Set the subnet address to 10.0.0.0 and restart DHCP monitor. Then if it doesn't work... on my system events relating to the DHCPD are in syslog/messages, maybe monitor that for errors when you restart DHCP Monitor.