August 2008
Intermediate to advanced
528 pages
10h 42m
English
book
Cisco Secure Firewall Services Module (FWSM)
by Ray CCIE No. 7050 Blair, Arvind CCIE No. 7016 Durai
Content preview from Cisco Secure Firewall Services Module (FWSM)
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Chapter 13 Understanding Application Protocol Inspection
Application protocol inspection provides three primary functions:
• It validates control traffic flows and/or verifies for RFC compliance.
• It monitors sessions for embedded IP addressing in the data portion of the packet.
• It examines session information for secondary channels.
Validation of control traffic flows may occur with protocols, such as Extended Simple Mail Transfer Protocol (ESMTP), where you want to allow only specific commands, such as DATA, HELO, QUIT, and so on. An example of RFC compliance verification is when the inspection engine is monitoring port 80 for HTTP traffic and another protocol (that is, Telnet) is attempting to use port 80 as well. Because the Telnet traffic ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.