We have been using our Vonage service behind our Linksys router for a while now, but call quality has been poor. Vonage has suggested we put the Motorola VT1005 right behind the cable modem and then string our existing Linksys router behind it. This is great for the VoIP service, however, now I am faced with a confusing and difficult setup for the port forwarding we were using on our Linksys network.
We have a few web servers, and other applications running on our internal network that we need visible to the Internet. On the Linksys unit, I simply setup port forwarding for the specific application ports to go to the appropriate internal IP address. Now, the Motorola VT1005 is introducing another layer of Network Address Translation. The Motorola unit is 192.168.102.1, while our Linksys network is 192.168.245.x (and we cannot easily change this). I tried setting up port forwarding for the appropriate ports on the Motorola unit to go to the WAN IP address of the Linksys router (which is now 192.168.102.100), but that did not work. I also tried setting up the WAN side of the Linksys router as a DMZ to the Motorola unit, also without success.
Is there a better way of doing this? It appears we need the QoS (Quality of Service) features from the Motorola unit to achieve proper voice quality, but we also need the port forwarding capability of the Linksys WRT54G (which is an 802.11g router with 4 LAN ports). I just cannot figure out how to get both at the same time!