Why system gives an error message "WARN : [ipv6_add_route] Unknown error" while bringing up the interface ?

Solution Verified - Updated -

Issue

  • Why setting static IPV6 with Gateway (IPV6_DEFAULTGW) gives an error "WARN : [ipv6_add_route] Unknown error" while bringing up the interface using ifup command ?
# ifup eth1 
WARN     : [ipv6_add_route] Unknown error

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • Red Hat Enterprise Linux (RHEL) 7
  • IPv6
  • NetworkManager not in use

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