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Detecting IP Address Filters
Geoff Huston — 13 Jan 2012

Until recently IP network operators were encouraged to set up so-called "bogon address filters" at the edge of their networks. These filters were intended to discard all incoming traffic where the source address in the IP header was from a block of addresses that was known to be unallocated. The inference was that a matching packet was either an unintentional leak from some privately addressed network domain or was generated using source address spoofing. In either case there is no point in delivering the packet, since it comes from a demonstrably fictitious source.

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