Benefits of second IP off cable modem?

Posts: 2 · New Forum Member Joined: Aug 14, 2008 Posts: 2

I have my V-Portal hooked up to my Dlink DGL-4500 as a client and setup qos on the D-Link to make any traffic coming to/from the V-Portal as number 1 priority. I've got 8mbit down and 768k up and haven't noticed any issues. The DGL-4500 seems to be pretty good at handling the traffic and qos.

My question is...I have seen many people talk about putting the Vonage adapter in parallel with your main router utilizing a switch off of the cable modem. So essentially the V-Portal would get its own public IP, but my other traffic would go down/up another IP through the main router. My ISP allows this, but I am having trouble thinking how this could benefit me. If I do that...wouldn't I still be bound by how the cable modem itself handles traffic? I mean if I'm streaming a bunch of packets through one IP, and the Vonage adapter needs traffic on the other IP, the cable modem still has to deal with all those packets in one pipe. The only benefit I could think of would be that the Vonage adapter wouldn't need to be NATd or have to pass through the firewall on the router.

Am I missing something?

Posts: 204 · Vonage Forum Master Joined: Dec 04, 2005 Posts: 204

There is no benefit and it might possibly be a detriment. If you have QOS enabled on your router or the V-Portal first, it will priority voice over other traffic. If each has its own public IP address, both are operating at the same priority.

You should be fine with your setup as it is. The only thing I would reccomend doing is turning off SIP Application Layer Gateway on the D-Link router, if you can on your model.