Why in ipsec configuration when 'phase2alg' is set to 'aes-sha2_256' , tunnel comes up but no traffic flows through it ?

Solution Verified - Updated -

Issue

  • In host to host ipsec tunnel configuration when phase2alg="aes-sha2_256" is set , ipsec shows the tunnel established but no traffic goes from one end to other.
  • When value is changed to phase2alg="aes256-sha1" traffic flows without problem.

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • openswan-2.6.32-37.el6
  • openswan-2.6.32-27.el6

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