Hi, >From the below link, we see that strong-swan currently does not support this standard. https://wiki.strongswan.org/projects/strongswan/wiki/IpsecStandards
However in 5.5.2 strongswan release note we found that - Support for handling IKEV2_MESSAGE_ID_SYNC notifies as responder (usually the original initiator of an IKE_SA) as defined in RFC 6311 <https://tools.ietf.org/html/rfc6311> was added Is there any possibility to support IPSEC_REPLAY_COUNTER_SYNC in any future release of strongswan to provide complete support for RFC 6311.. Regards, Nishit.
