How to permanently add "route add -host 10.20.30.10 reject" to a system

Solution In Progress - Updated -

Issue

  • How can the equivalent of route add -host 10.20.30.10 reject be permanently added to a system?

Desired effect:

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.20.30.10 -               255.255.255.255 !H        - -          - -

Environment

  • Red Hat Enterprise Linux 6 without NetworkManager
  • Red Hat Enterprise Linux 7 without NetworkManager

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