You aren't trying to connect the 2wire gateway and the linksys router through wireless, right?
If so, that Linksys model doesn't offer that capability.
How many ports does that 2wire Gateway have? Four(
like this one does), correct? If so, you can run a cable directly to your DVR into one of the additional ports.
If you were trying to avoid running a cable to your DVR, then get one of these options:
Wireless Ethernet adapter 1
Wireless Ethernet Adapter 2
Wireless Ethernet Adapter 3
Then again, I don't know more about what you're trying to do. So in case I was off, I'll wait for your response.