RFC 4891:Using IPsec to Secure IPv6-in-IPv4 Tunnel...
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AH

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2. Threats and the Use of IPsec
... ESP) or Authentication Header (AH) security association (SA) is established ...


4. IKE and IPsec Versions
... ESP [RFC4303] is not required, AH [RFC4302] can be used as an alternative to ESP ...
... RFC4302] can be used as an alternative to ESP. The main difference is that AH is able to provide integrity protection for certain fields in the outer IPv4 header ...
... case, and those particular fields are not believed to be relevant in this particular application, there is no particular reason to use AH. ...

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