GRE Keepalive does not work

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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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