Re: [CentOS] OT: routing between eth0 and ppp0 WITHOUT NAT

On 3/13/06, James Pifer jep@obrien-pifer.com wrote:

I'm trying to setup linux as a router instead of a MASQ/NAT over a VPN. So I'm trying to "connect" to private networks using the VPN as the conduit.

I presume you have set

net.ipv4.ip_forward = 1

in /etc/sysctl.conf ?

You also need to make appropriate entries in /etc/sysconfig/network-scripts/route-eth0 and /etc/sysconfig/network-scripts/route-ppp0. I don't think you need to do anything with iptables at all if sysctl.conf and the routes are set correctly.

See /usr/share/doc/kernel-doc-2.6.9/Documentation/networking/ip-sysctl.txt and also /usr/share/doc/initscripts-7.93.24.EL/sysconfig.txt for details.