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Automatic filtering to prevent network attacks

  • US 8,949,458 B1
  • Filed: 05/23/2008
  • Issued: 02/03/2015
  • Est. Priority Date: 02/07/2003
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving, in a network router, a packet via an interface having an interface designation that indicates the interface is connected to a device not within a local network to which the router belongs;

    accessing a data structure to identify a type of route associated with the packet, wherein the type of the route specifies an interior or exterior type of a routing protocol by which the route was learned by the network router; and

    automatically dropping the packet when the route associated with the packet is an internal route to a destination within the local network that was learned by the network router using an interior routing protocol.

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