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Re: Controlling HTTP & SMTP IP flow for 3 NIC's



John Summerfield wrote:
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.


The problem arises in part because of the complexity of the network.

I run several servers (smtp, ssh, www, imap), and they all work perfectly well from a single IP address, so I wonder, Why do you need so many?
Please refer to the several times I've explained, the router provided by my ISP is not accepting virtual IP addresses.


In some cases, the services are served from different boxes; ssh to where I work and it terminates on my desktop, smtp on another goes to one server or another, depending on where you are. It's how I receive email to this address from some locations, but _you_ can't email to it.





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