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ip route del has the same arguments as ip route add, but their semantics are a bit different.

Key values (to, tos, preference and table) select the route to delete. If optional attributes are present, ip verifies that they coincide with the attributes of the route to delete. If no route with the given key and attributes was found, ip route del fails. 1cm NB. Linux-2.0 had the option to delete a route selected only by prefix address, ignoring its length (i.e. netmask). This option no longer exists because it was ambiguous. However, look at ip route flush (sec.7.6, p.[*]) which provides similar and even richer functionality.