Firewall vs. IPS - Differences now (ISS, Intrushield 2.1?)

[Jacob Winston <jctx09 () yahoo com>]

Things are getting a little confusing. ISS claims that its Proventia boxes are also firewallas. Intrushield 2.1 has 
firewall/layer 4 filtering capabilities now. If the Intrushield box layer 4 acls now then what makes it not be equal to 
a firewall? What does a firewall do that an IPS doesn't as long as the IPS can do layer-4 access lists? Any info is 
apprecaited.

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