S8300 9600 phones keep getting DHCP conflict

[Irvineguy]

The phones are working fine then for no reason they reboot and then get a DHCP conflict. Any ideas?

 

[wildcard100001]

You might possibly you have static IP's assigned in your DHCP range... Have the network people check out your DHCP scope....for "knacks" (I believe that's what you call it) You may have to check every phone for a static IP.

thanks,

Wildcard

 

[SoDoTo]

We had a similar problem and it was down to overlapping scopes on the DHCP servers.

 

[wayneled]

when you have the problem, unplug your phone and ping the IP address. Obviously you shouldn't get a response, if you do then you have a DHCP issue. most likely as the other posts say, overlapping scopes.

 

[Irvineguy]

The Avaya support suggested a firmware upgrade on the phones.

How do I ping the phone since that the IP address assigned to the phone is cleared. Actually all the values are cleared.

The phones are on their own VLan and the lease time is set at 60 days.

 

[Irvineguy]

Sorry, what's an overlapping scopes?

 

[wayneled]

i don't mean ping the phone. if you know the ip address of the phone and its working ok, then you get the dhcp conflict error, unplug that phone, and ping the ip address it had. you shouldn't get a response since you unplugged the phone. if you do get a response, the address is assigned to something else on the network. make sure none of the components of the G700/S8300 have an ip address that is in the range of your ip phones.

An example of overlapping scopes would be this:
ip phone range =192.168.100.10-192.168.100.50 (all ip phones would be assigned an address somewhere in this range from the DHCP server)

laptop ip address range = 192.168.100.40-192.168.100.100

that's an overlap of 10 ip addresses.