"RTNETLINK answers: Invalid argument" when trying to create a static network route to a network on Red Hat Enterprise Linux 5

Solution Verified - Updated -

Issue

  • Add route showing errors:
    # ip route add 192.168.102.0/22 via 192.168.1.1 dev eth0
    RTNETLINK answers: Invalid argument
    

Environment

  • Red Hat Enterprise Linux 5
  • Creating a static route to an external network.
    • Commonly using a netmask other than 255.255.255.0 (or /24 for short).

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