Controlling HTTP & SMTP IP flow for 3 NIC's

[Tim Alberts]

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).