This file is indexed.

/etc/iproute2/rt_protos is in iproute 20111117-1ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# 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

#
#	Used by me for gated
#
254	gated/aggr
253	gated/bgp
252	gated/ospf
251	gated/ospfase
250	gated/rip
249	gated/static
248	gated/conn
247	gated/inet
246	gated/default