etc/iproute2/rt_protos

#
# Reserved protocols.
#
0	unspec
1	redirect
2	kernel
3	boot
4	static
8	gated
9	ra
10	mrt
11	zebra
12	bird
13	dnrouted
14	xorp
15	ntk
16      dhcp
42	babel
186	bgp
187	isis
188	ospf
189	rip
192	eigrp