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Stubb~enwiki (talk | contribs) m Changed "IPSec" to IETF standard of "IPsec". |
Length and links to IPsec topic articles added. |
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This works like Port numbers in TCP and UDP connections. What it means is that there could be different SAs used to provide security to one connection. An SA could therefore act as a set of rules.
Carried in [[IPsec#Encapsulating_Security_Payload|Encapsulating Security Payload (ESP)]] header or [[IPsec#Authentication_Header|Authentication Header (AH)]], it's length is 32 bits.
[[Category:Internet protocols]]
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