From: "René Gallardo" <rgallardo at desarrollosweb dot com>

>    I'm having problems to let AVG Free Edition update by itself from the
> internet throw the m0n0 firewall. I added Some "aliases":

Lets try this another way.  You are blocking something extra, as by default 
m0n0wall works fine with AVG.  I have it at home and at the office, so I 
know it works.  Turn on logging for all of your block rules, and see what 
hits.

                            Lee