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Re: [RRG] interesting presentations from RIPE



> 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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