/* sort -k2,2n */
RTPROT_UNSPEC	0
RTPROT_REDIRECT	1
RTPROT_KERNEL	2
RTPROT_BOOT	3
RTPROT_STATIC	4
RTPROT_GATED	8
RTPROT_RA	9
RTPROT_MRT	10
RTPROT_ZEBRA	11
RTPROT_BIRD	12
RTPROT_DNROUTED	13
RTPROT_XORP	14
RTPROT_NTK	15
RTPROT_DHCP	16
RTPROT_MROUTED	17
RTPROT_BABEL	42