/etc/iproute2/rt_tables default settings file in Linux Centos 6,7 and most other NIX's
This should apply to most Linux distributions just incase you get into trouble or wipe out the defaults by accident.
/etc/iproute2/rt_tables
#
# reserved values
#
255 local
254 main
253 default
0 unspec
#
# local
#
#1 inr.ruhep
Tags:
etc, iproute, rt_tables, default, settings, linux, centos, nix, sthis, distributions, incase, defaults, reserved, unspec, inr, ruhep,