/etc/iproute2/rt_tables.d/README is in iproute2 4.15.0-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | Each file in this directory is an rt_tables configuration file. iproute2
commands scan this directory processing all files that end in '.conf'.
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