RHEL: Policy based routing does not work when the incoming packets are redirected via iptables NAT rules

Solution In Progress - Updated -

Issue

  • When incoming TCP segments are directed to another port via iptables "-j REDIRECT" the policy routing that should route the response back to the sender is not used. Instead the default routing table is used.

Environment

  • Red Hat Enterprise Linux 7.5
  • Policy routing is based on a secondary address of the interface
  • incoming packets are addressed to the secondary address

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