default route
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o Loose Reverse Path Forwarding ignoring default routes
Other mechanisms are also possible, and indeed, there are a number of
...
... RPF, but differs in that it checks only for the existence
of a route (even a default route, if applicable), not where the route
points to. Practically, this could be considered as a "route ...
...
Also, many ISPs use default routes for various purposes such as
collecting illegitimate traffic at so-called "Honey Pot" systems or
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... route to, and
smaller ISPs may well purchase transit capabilities and use a default
route from a larger provider. At least some implementations of Loose
RPF ...
... provider. At least some implementations of Loose
RPF check where the default route points to. If the route points to
the interface ...
... RPF interface even in the presence of a default route. If such
fine-grained checking is not implemented, presence of a default route
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... interface even in the presence of a default route. If such
fine-grained checking is not implemented, presence of a default route
nullifies the effect of Loose RPF completely.
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... Loose Reverse Path Forwarding Ignoring Default Routes ...
... The fifth implementation technique may be characterized as Loose RPF
ignoring default routes, i.e., an "explicit route presence check".
In this approach, the router ...
... route is found. However, in the
lookup, default routes are excluded. Therefore, the technique is
mostly usable in scenarios where default routes are used only to
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... lookup, default routes are excluded. Therefore, the technique is
mostly usable in scenarios where default routes are used only to
catch traffic with bogus source addresses ...