Craig White wrote:
On Wed, 2008-01-23 at 09:53 -0800, Tim Alberts wrote:
A little background first..I run 2 servers, mail and web. The mail
server is down for hardware problems. I'm running both email and web on
one server. The web server has 3 network interfaces 1 for public email,
1 for public web, and 1 for private network. I use 3 cards because the
router I connect to the internet won't recognize multiple IP's for a
single hardware MAC.
The problem is, that my email messages seem to be going out the web
network interface. This is typically not a problem except for the
reverse DNS lookup fails which at least one domain (Comcast.Net) rejects.
My question therefore is, how can I route my sendmail traffic to go out
the correct ethernet interface? I'm sure I'll need to do the same for
the web traffic so web site spoofing alarms are triggered.
I have told sendmail to listen to the correct interfaces, but that
apparently doesn't mean only write to those interfaces. I don't see how
to control this by setting up my routes and I can only really think of
ways to block it in IPtables, not re-route it.
----
assuming that /etc/sysconfig/network has GATEWAY=SOME_IP_ADDRESS then
adding GATEWAYDEV=eth0 (or whatever) should identify which to use.
Craig
Craig, thank you for replying. However I don't think you understand.
The system is routing, but I need to be able to route by port, not just IP.
Email is on one IP, web is on another IP, both on the same network,
going through the same gateway to the internet. I have to do this
because the gateway doesn't recognize virtual IP on the same hardware MAC.
I need to configure the Linux system to send smtp traffic (port 25) to
eth2 and web traffic (port 80) web traffic to eth1. Both route to the
same gateway ISP router.
