Can't help you out in the tabula form... Anyways, a level 3 firewall (router based as you say) works at the network layer. Thus security will be based on source and/or destination IP. Also ports can be used. You create packet filters / port mapping, naming depends on the used products. Cisco calls them ACL.'s
One problem... They only route packets... They hardly check a damn thing. Well, some flag settings : ) A level 7 firewall will do Application Filtering. For instance, it could detect a HTTP string and decided that the content will not go throught (remember Nimda et al). A good resource for more firewall information could be http://rr.sans.org or you might try http://www.firetower.com. O, I was writing this msg and I checked firetower.com for yah: Here's a link with all the info... The link might even correct what I wrote, I am just to damn lazy to verify.... http://www.firetower.com/forum/applicationproxy.html meaculpa -----Original Message----- From: David Campbell [mailto:[EMAIL PROTECTED]] Sent: Monday, April 01, 2002 10:27 PM To: [EMAIL PROTECTED] Subject: Firewalls What is the difference between the various levels of Firewalls. My current requirement is comparing a (router-based) level 3 firewall to a (PIX) level 7 firewall. Can anyone explain the differences? Does anyone know of a good resource that defines/compares the attributes of firewalls of different levels (perhaps in tabular form)? Thanks, Dave
