GRE Keepalive does not work

Solution Verified - Updated -

Issue

  • Configuring GRE Keepalives between a network device (such as a Cisco router) and RHEL system result in the keepalives being dropped by the Linux machine, and the networking device considering the tunnel down.

Environment

  • Red Hat Enterprise Linux
  • GRE Tunnel to remote device, such as Cisco router
  • GRE Keepalives configured on remote device

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