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Hosts.all/Hosts.deny vs. a firewall?

So far I have the following setup:




ALL: my_work.domain

My intention is to prevent everyone from the 'outside' from reaching my box.  I do realize that anyone in my_work.domain would also be able to get at it.

It is my understanding that this will prevent anyone not in my_work.domain from getting to my box with telnet, ftp, etc.  Is this correct?  Is this secure?  If this is indeed correct could someone tell me why I would need/want a firewall and/or what benefit it would provide me over what I already have setup?  More specifically how does a firewall differ from using the hosts.allow/hosts.deny files as I described above.

Appreciate any advice on this...


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