From: Niall O Broin (niall at domain linux.ie)
Date: Tue 22 May 2001 - 22:34:46 IST
On Tue, May 22, 2001 at 05:29:09PM +0100, Fergal Moran wrote:
> firewall is not routing external packets through. How do I change this
> behaviour for selected ports - I have noticed the forwarding rules but these
> only forward a specific port to a specific IP address - but we may have 2 or
> 3 different mailservers running on different machines so this is not really
> an option.
Forwarding rules are what you need, but of course they can only forward one
port to one IP. If you want to be able to have external connections to e.g.
port 25 be forwarded to a random or round-robin choice from a group of
internal machines then you need something more than smoothwall i.e. a level
4 switch such as a Cisco local director, which keeps track of connections
(because if a.b.c.d connects to your box at e.f.g.h and gets forwarded to
s.t.u.v it had better keep that connection for the duration of this session
and not suddenly start being forwarded to w.x.y.z). Unless you have a LOT of
external connectivity, why would you need to run more than one mailserver box
More details of exactly what you are trying to do and we might be able to be
of more help.
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