nanog mailing list archives

Re: filtering /48 is going to be necessary


From: Joel jaeggli <joelja () bogus com>
Date: Fri, 09 Mar 2012 22:32:13 -0800

On 3/9/12 22:02 , George Bonser wrote:

An ISP that has been given a /32 or larger allocation from PA space
and might have 10,000 customers each assigned their own /48 could
instantly more than double the size of the IPv6 routing table if they
disaggregated that /32.

The problem here is that each /32 is 65536 /48 networks.  An even
larger net, say a /30 that disaggregates due to a router
configuration goof means a potential of a huge number of networks
suddenly flooding the Internet.

I'm well into my second decade of having a v6 prefix in the dfz and am
passingly familiar with powers of two...




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