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v6 & DSL / Cable modems [was: Private use of non-RFC1918 IP space (IPv6-MW)]
On Wed, 4 Feb 2009, Joe Abley wrote:
> I see people predicting that giving everybody a /56 is insane and will
> blow out routing tables. I don't quite understand that; at the regional
> ISP with which I am most familiar 40,000 or so internal/customer routes
> in BGP, and I have not noticed anything fall over. This is 2008: we are
> not dealing with routers maxed out with 256MB of RAM. And this is
> without any attempt to aggregate per LNS, or per POP.
What you do is that you do /40-44 per router or so and announce this to
the rest of the network, then internally from that you assign /48 to /56
per customer out of that block.
IPv6 enables us to lower address use and get less routes in the core
network (both within the ISP and globally).
Mikael Abrahamsson email: swmike at swm.pp.se