Re: Two gateways on same network
Hans du Plooy wrote:
This worked fine with two public IPs on the same network, with the same
gateway (colo provider gave me two IPs), but I'm not sure how being
behind two natting firewalls would impact this. I also don't have
physical access to the box, so I've got to do it right first time :-)
Problem is that you can't use two default routes at the same time. And
from both NAT engines you'll get "normal" looking internet traffic.
Nothing that you can see, except the change dest. IP (your local IP).
So traffic that comes in via eth1 will go out to eth0. I'm doing the
same but with one central firewall. Then it's easy, you have to make the
firewall route the traffic to the right ISP back out. Well easy... in
most cases you have to make seperate SAT (port forwarding) rules for two
different internal IP's on the same interface to make that work. But
it's doable. What you are trying to do will be a bit tricky I think.
A system can have only one default route, and traffic from the MTA will
be addressed to an external IP. Maybe with two NICs and some trickery
you can fix something.
F/X Services Managed Hosting