Hi,
I've been googlin' for a solution for a while now, and no luck yet. Can someone enlighten me how's this possible?

I'm running on dual WAN networks:
Eth0 (IP: x.x.x.2, GW x.x.x.1): Running with a public IP (ISP1) address exposed to the internet.
Eth1 (IP: y.y.y.2, GW y.y.y.1): Running with a private IP address (ISP2) for our branches data link (No Internet access), this is used for our VoIP solution.

Now, whenever we enable Eth0, VoIP drop calls (for the reason of having multi default gateways). How do I disable this from happening? Also, how do I enable Eth0 to allow Internet access to my VoIP netwotk (if possible)?

Your help is highly appreciated,
Thanks!

What does the output of "route" look like?

route -n output:

192.168.7.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.10.22.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
0.0.0.0 10.10.22.1 0.0.0.0 UG 100 0 0 eth1
0.0.0.0 192.168.7.1 0.0.0.0 UG 100 0 0 eth0


Thanks.

Well, that’s your problem: you have two default routes, and the one on top is the wrong one. To get rid of this problem you could run (as root):
As for your other problem (getting your private Voip network access to the internet) you have to do a couple things:

1. Enable ip forwarding on your machine (i.e., “sysctl net.ipv4.ip_forward=1”).
2. Make the forwarding machine the default gateway for all the other machines on the network. Instructions vary.