It's not just about the CPE devices and customer LANs. Address conflicts are also going to happen within the ISP network / back-office etc. 172.16.0.0/12 is used there.
Daryl On 30 November 2011 20:52, Brian E Carpenter <brian.e.carpen...@gmail.com>wrote: > On 2011-12-01 09:28, Chris Grundemann wrote: > ... > > It is more conservative to share a common pool. > > It suddenly occurs to me that I don't recall any serious analysis > of using 172.16.0.0/12 for this. It is a large chunk of space > (a million addresses) and as far as I know it is not used by default > in any common CPE devices, which tend to use the other RFC 1918 blocks. > > I realise that ISPs with more than a million customers would have to > re-use this space, whereas a /10 would only bring this problem above 4M > customers, but at that scale there would be multiple CGN monsters anyway. > > Sorry to bring this up on the eve of the telechat. > > Brian > _______________________________________________ > Ietf mailing list > Ietf@ietf.org > https://www.ietf.org/mailman/listinfo/ietf >
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