Re: ACLs vs. full firewalls

[Karl Auer <kauer () biplane com au>]

On Wed, 2009-04-08 at 10:46 +1200, Nathan Ward wrote:
> > I'd be interested to hear why people use firewalls.

> End hosts are not always trustworthy.
>
> If a host is compromised, should it be able to send anything and  
> everything out to the public network?

A packet filter looks at the "top surface" of the packet, and processes
the packet accordingly - based on things like the protocol, the source
address, the destination address, the TCP flags and so on.

A firewall, on the other hand, makes decisions based on knowledge about
the data being carried.

I.e., firewall != packet filter; my question related to firewalls.

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer () biplane com au)                   +61-2-64957160 (h)
http://www.biplane.com.au/~kauer/                  +61-428-957160 (mob)

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