Constant netlink_packet_route::rtnl::constants::RT_TABLE_DEFAULT

pub const RT_TABLE_DEFAULT: u8 = 253;

The default routing table.

The default table is empty and has little use. It has been kept when the current incarnation of advanced routing has been introduced in Linux 2.1.68 after a first tentative using “classes” in Linux 2.1.15.

Source

This documentation is taken from Vincent Bernat’s excellent blog