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

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

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To: For users of Fedora <fedora-list@xxxxxxxxxx>

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

From: Tim Alberts <talberts@xxxxxxxxxxxxx>

Date: Wed, 23 Jan 2008 14:12:20 -0800

In-reply-to: <4797B29E.1010101@xxxxxxxxx>

Organization: Measurement Systems International

References: <47977F36.8020402@xxxxxxxxxxxxx> <47979616.9020203@xxxxxxxxx> <4797AB3A.5020302@xxxxxxxxxxxxx> <4797B29E.1010101@xxxxxxxxx>

Reply-to: talberts@xxxxxxxxxxxxx, For users of Fedora <fedora-list@xxxxxxxxxx>

User-agent: Thunderbird 2.0.0.9 (Windows/20071031)

Les Mikesell wrote:

Tim Alberts wrote:
I have told sendmail to listen to the correct interfaces, but thatapparently doesn't mean only write to those interfaces. I don'tsee how to control this by setting up my routes and I can onlyreally think of ways to block it in IPtables, not re-route it.
You probably used the DaemonPortOptions entry in sendmail.mc tocontrol the listening side. Do the same with ClientPortOptions foroutbound connections.
Boy it sure sounded like a solution. This may guarantee thatsendmail sends on the specified IP interfaces. However I think theunderlying linux routing is still the problem because the problemhasn't gone away.
Routing shouldn't affect a source IP. What does tcpdump say is beingused? Linux does do some strange stuff with addresses on the samemachine though so anything is possible here.

tcpdump shows everything going via the web IP (eth0). I see nothinggoing out the smpt IP (eth2).