[151028] in North American Network Operators' Group
Re: filtering /48 is going to be necessary
daemon@ATHENA.MIT.EDU (Joel jaeggli)
Sat Mar 10 01:33:08 2012
Date: Fri, 09 Mar 2012 22:32:13 -0800
From: Joel jaeggli <joelja@bogus.com>
To: George Bonser <gbonser@seven.com>
In-Reply-To: <596B74B410EE6B4CA8A30C3AF1A155EA09D0C880@RWC-MBX1.corp.seven.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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...
