Bráulio Gergull wrote:
> Hi all,
> 
> I've been using SuSE and SuSEfirewall for a long time, and now I'm
> giving Shorewall a try. It's a great piece of software and I have
> already moved some systems to Ubuntu and Shorewall very easily, just
> following the docs.
> 
> But now I'm moving another system and am facing a problem that I could
> not find in the docs.
> 
> How do I do MASQUERADING to a specific target?
...
> 
> I first would put it in masq file, but I couldn't find a way to specify
> the destination address and port.

First of all, using MASQUERADING as a means for controlling access is
not a good idea. You should use MASQUERADING to rewrite the SOURCE IP
address and you should use filter rules to control access.

Then I would put it in the rules file,
> but then and cannot specify MASQ as the action.
> 
> What's the right way to do it?

/etc/shorewall/masq:

<external if>:xxx.xxx.xxx.xxx   192.168.0.0/24  -       tcp     3389

/etc/shorewall/rules:

ACCEPT  loc:192.168.0.x-192.168.0.z     tcp     3389

The latter, of course, assumes that your loc->net policy is not ACCEPT.

> By the way, I'm running Ubuntu 8.0.4 LTS and Shorewall 4.0.6.

There are 4.2 Shorewall packages available for Hardy -- see the
Shorewall download page.

-Tom
-- 
Tom Eastep        \ When I die, I want to go like my Grandfather who
Shoreline,         \ died peacefully in his sleep. Not screaming like
Washington, USA     \ all of the passengers in his car
http://shorewall.net \________________________________________________

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