We have a Cisco 2811 and are separating our server/user traffic by putting the users on a separate LAN. Currently all devices are in the 192.168.100.0/24 subnet. After the split it will be:
F0/0 - 192.168.100.1/24 - This is the server subnet
F0/1 - 192.168.101.1/24 - This is the user subnet
The office just installed a new voip phone system a couple weeks ago. Since there were not two RJ45 jacks installed in all the offices/cubicles the network cable runs to the phone and then from the phone to the PC and they share an IP address. This has been working fine on the single subnet setup.
We have configured F0/1 and took a user and gave them a static IP on the 192.168.101.0/24 subnet for testing. The PC works fine and they are able to get around the network and reach across the corporate WAN successfully. However the phone doesn't work. It states 'no system found' which we are guessing means it can't connect to the phone server that is on the 192.168.100.0/24 subnet.
I have added the 'ip helper-address' command to the interface so we can get DHCP working in the new subnet but that isn't giving the phones a connection.