IPv6 route annoucement

John York johny at griffintechnology.com
Thu Aug 7 21:37:25 UTC 2014

Yeah, we're good in WHOIS, we're trying to announce only the aggregate, I
think we have all our ducks in a row.

Thanks to all who replied on- and off-list with your input. I'll go back
to the ISP with the info from you guys and girls, and hopefully they'll
listen to reason.


-----Original Message-----
From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of Justin M.
Sent: Thursday, August 07, 2014 1:56 PM
To: North American Network Operators' Group
Subject: Re: IPv6 route annoucement

On Thu, 7 Aug 2014, John York wrote:

> Hoping to not start a war...
> We (a multi-homed end-user site) are finally getting IPv6-enabled
> connectivity from one of our ISPs. In conversations regarding our BGP
> config, the ISP has balked at allowing us to advertise our ARIN-assigned
> /44, saying things like, "do you know how many addresses that is!!??"

Sounds like the ISP in question is in need of some serious IPv6 clue.  The

number of hosts means nothing, in terms of BGP advertisements.  In fact,
fewer announcements is better.  De-aggregation bloats the global routing

Most carriers I've seen will accept IPv6 announcements as small as a /48.

If your /44 was assigned by your RIR, and it's documented in their
whois/rwhois/route registry, your ISP really doesn't have a leg to stand
on, regarding not accepting your announcement.

> Am I way off base in thinking this network size is not out of the norm?
> know it's a lot of addresses (19 octillion-something?), but that
> assignment was based on the same criteria that got us a /22 in v4 space.
> Should accepting a /44 in v6 not be equivalent, policy-wise, to
> a /22 in v4?

The largest IPv6 prefix I saw in the global Internet routing table the
last time I looked (a few months ago) that wasn't for a special purpose
was a /19.... ~33 million times larger than a /44.

Your ISP should have more constructive things to do than hassling a
customer about announcing a /44.


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