This file is indexed.

/etc/iproute2/rt_dsfield is in iproute2 3.12.0-2.

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

The actual contents of the file can be viewed below.

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0x00	default
0x10	lowdelay
0x08	throughput
0x04	reliability
# This value overlap with ECT, do not use it!
0x02	mincost
# These values seems do not want to die, Cisco likes them by a strange reason.
0x20	priority
0x40	immediate
0x60	flash
0x80	flash-override
0xa0	critical
0xc0	internet
0xe0	network
# Newer RFC2597 values
0x28	AF11
0x30	AF12
0x38	AF13
0x48	AF21
0x50	AF22
0x58	AF23
0x68	AF31
0x70	AF32
0x78	AF33
0x88	AF41
0x90	AF42
0x98	AF43