Seriously confused about linux routing

Ok, so, what I'm trying to do is to route between to 10.0.0.0/16
subnets.

There are two computers, connected via VPN, that are involved with the
routing.

Server 1: IP Address 10.10.0.1 and 192.168.1.1
Server 2: IP Address 10.15.0.2 and 192.168.1.2

The VPN is connecting the computers via the 192. addresses. I'm
trying to route traffic originating at 10.10.0.0/16 and direct it to
the 10.15.0.0/16 subnet and vise versa, also, beyond that, I'm trying
to route all internet-bound traffic on 10.10.0.0/16 out through the
10.15.0.0/16 network.

I have enabled ip_forward on both servers ( echo 1 > /proc/sys/net/
ipv4/ip_forward and editted /etc/sysctl.conf for future reboots, etc.)


So far, for the routing tables, on Server 1:

192.168.1.0 0.0.0.0 255.255.255.0 U 0 0
0 eth1
10.10.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
10.15.0.0 192.168.1.2 255.255.0.0 UG 0 0 0
eth1
0.0.0.0 192.168.1.2 0.0.0.0 UG 0
0 0 eth0

On Server 2:

192.168.1.0 0.0.0.0 255.255.255.0 U 0 0
0 eth1
10.15.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
10.10.0.0 192.168.1.1 255.255.0.0 UG 0 0 0
eth1
0.0.0.0 10.15.0.1 0.0.0.0 UG 0 0
0 eth0

It appears that these two servers can communicate, and even access
computers on the other subnets, however, I'm having problems with the
internet connection from 10.10.0.0/16 routing out through the
10.15.0.0/16 (10.15.0.1 gateway specifically).

How can I get this to work?

Thanks

.

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