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

[Tim Alberts <talberts@xxxxxxxxxxxxx>]

Les Mikesell wrote:
> Tim Alberts wrote:
>
> > > > 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.
> > >
> > > You probably used the DaemonPortOptions entry in sendmail.mc to 
> > > control the listening side.  Do the same with ClientPortOptions for 
> > > outbound connections.
> >
> >
> > Boy it sure sounded like a solution.  This may guarantee that 
> > sendmail sends on the specified IP interfaces.  However I think the 
> > underlying linux routing is still the problem because the problem 
> > hasn't gone away.
>
> Routing shouldn't affect a source IP.  What does tcpdump say is being 
> used?  Linux does do some strange stuff with addresses on the same 
> machine though so anything is possible here.
tcpdump shows everything going via the web IP (eth0).  I see nothing 
going out the smpt IP (eth2).