Tuesday, February 2, 2010

ipsec: Authentication Header (AH) and Encapsulating Security Payload (ESP)

The IPsec suite is a framework of open standards. IPsec uses the following protocols to perform various functions:

The IPSec headers (AH and ESP) can be used in transport mode or tunnel mode. In transport mode, the original IP header is followed by the AH or ESP header. If ESP is used in transport mode, only the upper-layer (e.g., TCP, UDP, IGMP) is encrypted. The IP header is not encrypted.

Additional Reading:





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