v6 multihoming (Re: The Choice: IPv4 Exhaustion or Transition to IPv6)

Steve Gibbard scg at gibbard.org
Fri Jun 29 21:52:10 UTC 2007

On Fri, 29 Jun 2007, [ISO-8859-1] Nicolás Antoniello wrote:

> To use AS path prepend when you advertise just one prefix does not solve
> the problem...in this case it actually make it worth, 'cos you may find
> all your trafic coming from only one of your uplinks.

Despite being a v6 skeptic, I'm not sure I understand what the issue is 
here.  Lots of networks multihome with only single v4 prefixes.  In 
general, different upsteram providers are close to different portions of 
the Internet, so you end up with some traffic coming on each connection. 
If there's a serious imbalance, it's usually somewhat adjustable with AS 
path prepending, and if that doesn't work it probably means you should 
have a more diverse set of upstream providers.

No, you don't get as much granularity as you do when adjusting outbound 
traffic flows, or as much as you'd get by manipulating lots of little 
announcements, but it's often close enough.

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