I'm thinking of using my previous TP LINK 941nd v3.2 DDWRT for vlan bridging following riz's guide. FINALLY managed to make my wifi 150mbps instead of 65mbps using my draft n wifi adapter.

Do i need to change the default ip of the router from 192.168.1.1 to another 192.168.x.1
Default tmnet DIR 615 ip is 192.168.0.1
Not sure the modem* ip, do i need to change ddwrt's ip?

additionally, would there be problems if both DIR 615 and ddwrt using the same ip? Can i access DIR 615 webgui while connected to ddwrt ?
Thanks