ESP

(Encapsulating Security Protocol)







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Security Parameters Index (SPI)
Sequence Number
Payload (variable length)
Padding (<= 255 bytes)
padding continued
Pad Length
Next Header
Authentication Data (variable length)

 

IGMP Parameters

Security Parameters index (SPI)8 bits
Sequence Number (monotonically increasing). 32 bits
Payload Length - size of AH header 32 bits
Payload Data. variable length.
Padding - pad to end of payload block. (0-255 bytes).
Pad Length (length of Padding field). 16 bits
Next Header - protocol of the payload data. 16 bits
Authentication Data (intecrity check value). variable length