router
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... ISP
assigns a better metric which is not propagated outside of the
router, either a vendor-specific "weight" or a protocol distance to
prefer the directly received routes. With BGP ...
... RPF filtering between the primary and secondary edge routers; in
particular, when applied to multihoming to different ISPs ...
... (i.e., the same prefix(es), through all the paths) propagating to all
the routers performing Feasible RPF checking. For example, this may
not hold e.g., in the case where a secondary ISP ...
... default routes, i.e., an "explicit route presence check".
In this approach, the router looks up the source address in the route
table, and preserves the packet if a route ...
... ingress
filtering at the edges of ISPs where appropriate, at the routers
connecting LANs to an enterprise network ...
... deployment of ingress filtering
may not be readily apparent. The routers and other ISP
infrastructure are vulnerable to several kinds of attacks ...
... ISP [4][5]. This way the edge routers are configured to first
inspect the source address of a packet destined to an ISP ...
... ISP.
If such a scenario is applied exhaustively, so that an exit router is
chosen in the edge network ...
... The closer to the actual source ingress filtering is performed, the
more effective it is. One could wish that the first hop router would
ensure that traffic being sourced from its neighboring end system was
...
... ensure that traffic being sourced from its neighboring end system was
correctly addressed; a router further away can only ensure that it is
possible that there is such a system within the indicated prefix.
...
... Hagino, J. and H. Snyder, "IPv6 Multihoming Support at Site Exit Routers", RFC 3178, October 2001. ...