Why does Openswan only encapsulate traffic one-way?

Solution Verified - Updated -

Issue

  • Why does Openswan only encapsulate traffic one-way?
  • I have configured IPSec from one system to another system, but a packet capture shows ESP is only travelling one way, and return traffic is in plain text.

Environment

  • Red Hat Enterprise Linux
  • Openswan
  • IPSec tunnel between two systems

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