Redirect Outbound SMTP Traffic to Specific Server - 837 and 2621

Discussion in 'Cisco' started by Andrew Albert, Jul 21, 2004.

  1. Bellsouth recently changed their services down here, so that all
    outbound SMTP traffic has to go through their

    What I would like to do, is to configure our remote 837 and 2621
    routers to either redirect all outbound smtp traffic (regardless of
    their original intended destination) to bellsouths mail server ( ), or at least redirect outbound traffic that would
    normally have been handled by our own offsite mailserver, to instead
    use bellsouths... ( all of this to avoid have to keep switching out
    default mail servers on our laptop users, etc).

    I am guessing that there are some commands utilizing ip nat outside,
    that would do the trick, but so far I have not been able to make
    anything work.... Any insight would be appreciated.

    Andrew Albert, Jul 21, 2004
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  2. I think NAT can only do this kind of port redirection for inbound
    traffic, not outbound. *Maybe* there's some way to do it by pretending
    that outside is inside and vice versa, but that won't work if you're
    also doing ordinary NAT (since you need to identify inside and outside
    accurately for that to work).
    Barry Margolin, Jul 21, 2004
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  3. Would using PBR to redirect the packets and then setting up a static
    translation for the destination to the Bellsouth mail server work?

    I think this is doable, but I've only ever tried it with PBR and doing
    destination rewriting on the target host.

    Paul S. Brown, Jul 21, 2004
  4. You might need to throw in NAT-on-a-stick (using a loopback interface)
    to make the router act like the destination host.
    Barry Margolin, Jul 21, 2004
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