If by "Firewall" you hear "masquerading" or something like that, it may make sense. Masquerading only open oprts to the outside world when a machine from the inner world wants to communicate with the outside world. In that sense, it is quite safe. Read the security issue about masquerading and FTP for SuSE 6.4. Olivier Ragnar Beer wrote:
Howdy everybody!
To secure my machine as good as possible from the outside world I have closed all the ports that I don't need. So the only ports left open are ssh, http and https. Above that - does it make any sense to install a firewall on the _same_ machine (I can't afford another one at the moment)?
--Ragnar
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-- Olivier Daigle Projet Harfang (514) 396-8800 ext.7699