/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
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