(Internet Protocol Security)
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
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next header
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payload length
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reserved
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Security Parameters Index (SPI)
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Sequence Number
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Authentication Data (variable length)
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IGMP Parameters
Next Header 8 bits Payload Length - size of AH header 8 bits Reserved. 16 bits. Security Parameters Index (type of security implemented). 32 bits. Sequence Number (monotonically increasing). 32 bits Authentication Data (intecrity check value). variable length