No traffic goes through an established IKEv1 IPsec tunnel

Solution Verified - Updated -

Issue

  • IKEv1 IPsec connections are established successfully but no traffic comes through (the peers cannot ping each other).
  • ESP traffic is received by the network interface successfully but cannot be decoded.
  • XfrmInTmplMismatch or XfrmInStateProtoError XFRM statistics are increasing.
  • Interoperability problems of libreswan over IKEv1 with other implementations or with older versions of libreswan.

Environment

  • Red Hat Enteprise Linux 8.3
  • libreswan-3.32-6.el8 and libreswan-3.32-7.el8_3

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