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Date:      Thu, 15 Nov 2001 09:41:19 +0100
From:      Enriko Groen <enriko.groen@netivity.nl>
To:        'Blake Crosby' <dev@samurai.com>, freebsd-isp@freebsd.org
Subject:   RE: Source Based Routing
Message-ID:  <510EAC2065C0D311929200A02472526237A505@NETIVITY-FS>

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I tried to do this with ipfilter, but never managed to get it working.
Lately I found a packaged called brouted which should do source-based
routing.
Still have to check and try it.

Let me hear when you succeed succesfully!


-----Original Message-----
From: Blake Crosby [mailto:dev@samurai.com]
Sent: Thursday, November 15, 2001 6:31 AM
To: freebsd-isp@freebsd.org
Subject: Source Based Routing


I'm sorry if this is off topic, nor is directed at the wrong list.

I have cable and DSL.  I want to use cable for most of my traffic, as it
is cheaper.  But I want to use DSL for incoming SMTP connections,
because DSL provider allows me to run an SMTP server (cable provider
forbids it) and gives me a permanent IP.  I don't want to have to use
someone else's mail server as a gateway to mine.

The cable provider will not let me send packets back to the Internet
with the source address of my DSL IP.  This causes a problem when a
remote site tries to connect to DSL IP port 25, but the reply packets
get sent out the default route of cable.

How can I make packets for a TCP connection from the DSL IP, go out the
DSL interface, no matter what the IP of the other end of the TCP
connection is?

There used to a be a FreeBSD port called brouted which I think might let
me do it, but I can't find it anywhere now (apparently it had security
flaws).


Blake Crosby
dev@samurai.com
http://www.blakecrosby.com

"It's good to see that you haven't
  lost your talent for saying something
  so completely outrageously false
  it defies any possible retort."
     - Mike Hodnett



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