I have an 837 which is running as (amongst other roles) the default gateway for the lan. We recently changed our lan IP address range from class b to class c. I changed the 837 IP address with the Cisco web interface (CRWS). It works fine in most respects. However, from a command line the Internet address of Ethernet0 is shown as the old class b address, and the new class c IP address is shown as the secondary ip address. As follows:
Ethernet0 is up, line protocol is up Internet address is 126.96.36.199/16 Broadcast address is 255.255.255.255 Address determined by non-volatile memory MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is disabled Secondary address 192.168.10.250/24
I have also noticed that when I ping an external Ip address from a machine that is denied external access by an ACL, I get a message coming back as "Destination Net Unreachable" which is what I'd expect but the message says it comes "from" the old class b ip address.
So, my question, (for anyone with the knowledge and inclination to help!), is - how do I change it the IP address from the old class b one, and what should I change it to?
Thanks in advance, SW