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 (ka...@biplane.com.au) +61-2-64957160 (h) http://www.biplane.com.au/~kauer/ +61-428-957160 (mob) GPG fingerprint: 07F3 1DF9 9D45 8BCD 7DD5 00CE 4A44 6A03 F43A 7DEF
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