This is the workflow with which my application uses the file rt_tables.

* The administrator of a system, after the install of the application
  will be directed to modify (manually) the file rt_tables adding a
  certain range of ID numbers reserved for its tasks.
    E.g.
    # Reserved for (MY_APP)
    200 myapp_reserved_table_200
    199 myapp_reserved_table_199
    198 myapp_reserved_table_198
    ...
    # END Reserved for (MY_APP)
* The application can alter the names for those tables by directly
  altering the file rt_tables.
* The application issues 'ip' commands that involve the use of such
  names.
    E.g.
    ip rule add table mytablename
    ip route add 169.254.1.1 dev eth0 table mytablename
    ip route add 10.0.0.16/28 via 169.254.1.1 dev eth0 table mytablename

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https://bugs.launchpad.net/bugs/1658298

Title:
  The (administratively maintained) mapping file /etc/iproute2/rt_tables
  is not writeable.

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