Re: Two internet connections

From: Hans du Plooy (hansdp_at_sagacit.com)
Date: 05/29/05

  • Next message: Adam Majer: "Re: HP 3325 Inkjet on Sarge" 
    To: debian-user@lists.debian.org
Date: Sun, 29 May 2005 19:46:35 +0200

    On Sat, 2005-05-28 at 10:57 +0200, Meni Shapiro wrote:
    > Hi,
    >
    > You failed to mention what SMTP server you are running.
    Sorry, I didn't think that would make a difference. The SMTP issue is a
    side effect of the routing problem. The machine responds to all
    connections from foreign networks via the default gateway, instead of
    the interface that the connection was made two. It's postfix by the
    way :-)

    The setup looks like this. eth0 is local network, 192.168.1.1 is the
    default gateway (IP-COP firewall). eth1 is connected to a router, which
    is connected to a least line. For argument's sake, lets say eth1 is
    203.203.203.21 (and the router is .20). eth1 is a publicly routeable
    IP. It used to be the only internet connection, but the leased line is
    going to be axed soon. This machine used to be the firewall for the
    network too, doing NAT with iptables, nothing fancy, as well as being
    the mail gateway for an exchange server in the network. Now it's just
    running postfix.

    So what happens is a connection comes in on eth1 from somewhere on the
    internet, and the box tries to reply via the default gateway, which is
    connected to a different ISP.

    I found this:
    http://linux-ip.net/html/adv-multi-internet.html
    which seems to be the answer to my problem, will try it out tomorrow
    when I have access to the building.

    Thanks 

    -- 
Hans du Plooy
SagacIT (Pty) Ltd
hansdp at sagacit dot com
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