January 2008
Intermediate to advanced
624 pages
14h 16m
English
Content preview from Windows Server® 2008 TCP/IP Protocols and ServicesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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IPsec NAT Traversal
IPsec was designed to provide end-to-end security for two computers located in the same address domain. If two computers are located in different address domains, such as private IP addresses used on a home network and public IP addresses used on the Internet, then the addresses must be translated for communication to occur. The translation of addresses and TCP or UDP ports for network address translation to connect users to the Internet invalidates the security services of IPsec. Specifically, address and port translation causes the following problems for ESP-based IPsec traffic:
For ESP-protected packets, the TCP and UDP ports are encrypted and, therefore, cannot be translated.
ISAKMP messages calculate hashes and signatures ...
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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.