We have an existing (old) network (10.0.0.0/24) and we're trying to add another (new) subnet (22.214.171.124/24) using a Cisco 2901 router. I added the appropriate routes and tested everything out. We're good. I can ping across to the old subnet, can get to the Internet, etc.
On the new subnet we have a Cisco 2504 WLC with a few access points. The WLC hands out DHCP.