I am trying to configure my Adtran 4305 for a new P2P line. I selected T1 3/8 port and want to assign the internal IP address as 192.168.1.3 to the port PPP4. When I give it a subnet mask of 255.255.255.252 I get an error
Error: Bad mask 255.255.255.252 for address 192.168.1.3
I have other t1's configured with different IP addresses on Ports T1 3/1-3/6 but the only differences is they are two bound together.
Any suggestions would be appreciated.