When I got Vonage, my box came with a Linksys router that had a built-in ATA.

Here is my setup:

Modem > Linksys/Vonage box (192.168.15.1 + DHCP running) > Netgear (192.168.0.1 + DHCP running) > PC

The above setup works, but the Linksys firewall is active. And because it only lets me port forward or use DMZ in the 192.168.15.x grouping, I can't pass things onto my PCs or the Netgear router.

So, step 1, I turn off DHCP on the Linksys/Vonage box. All works fine.

Step 2, I assign the Linksys/Vonage box an IP of 192.168.0.32 (so all boxes have similar IPs). But now, I can not connect to the Linksys/Vonage box. I don't understand why...

Modem > Linksys/Vonage box (192.168.1.32 + no DHCP) > Netgear (192.168.0.1 + DHCP running) > PC

I can still get on the internet from behind both boxes, but I can not log into the Linksys/Vonage box to set port forwarding or to put my Netgear in the DMZ....

Am I over looking something?

UPDATE: This setup only seems to work for a short time before the internet stops reaching the Netgear box...Then I have to reset the Linksys to factory default to get everything (minus port forwarding) working again.