> Daniel Karrenberg and few others talked about routing table > fragmentation and why so many entries are /24s. His data points to the > direction that a big fraction of the advertised /24s are from > de-aggregations of bigger allocations. Obviously there are many reasons > for this, including traffic engineering, multihoming, etc. However, at > least for me it was news that one possible reason for doing this would > be to "protect" yourself against prefix hijacking. By advertising /24s > you reduce the likelihood of being hijacked with a more specific route. > If true, one action that needs to be taken to reduce routing scalability > problem is to secure the system in some proper way. Here are the > presentations: > http://rosie.ripe.net/ripe/meetings/ripe-56/presentations/uploads/Monday/Plenary%2016:00/upl/Karrenberg-IPv4_Prefix_Lengths.LGnt.pdf > http://rosie.ripe.net/ripe/meetings/ripe-56/presentations/uploads/Tuesday/Plenary%2014:00/upl/Karrenberg-Response_to_Prefix_Length_Question_from_Yesterday.xXAg.png > > Have people here actually seen such "protection" as a reason for someone > to de-aggregate their prefixes? Its extremely common. Dave
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