1RTN_UNSPEC 0 2RTN_UNICAST 1 3RTN_LOCAL 2 4RTN_BROADCAST 3 5RTN_ANYCAST 4 6RTN_MULTICAST 5 7RTN_BLACKHOLE 6 8RTN_UNREACHABLE 7 9RTN_PROHIBIT 8 10RTN_THROW 9 11RTN_NAT 10 12RTN_XRESOLVE 11 13