If you use either AH or ESP to protect traffic between two peers, two SAs are required to protect incoming and outgoing flows. If you use both AH and ESP to protect traffic between two peers, four SAs are required, two for each protocol.
https://support.huawei.com/enterprise/es/doc/EDOC1100037956?section=j006&topicName=basic-concepts-of-ipsec
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jjbt_112
2 years, 9 months ago