RE: Re: Comcast's 6to4 Relays

[Bhoomi Jain <bhoomij () india com>]

Mr. Delong,

I am simply trying to explain that running a 6to4 on your network is a good idea, however advertising the anycast 
prefix to other networks has some risk, especially if you're experiencing problems with your Internet peerings.  
Hopefully Comcast will upgrade its capacity soon.  I appreciate Mr. John's continued leadership and contribution to the 
IPv6.

Sincerely,
Bhoomi Jain

At 20 Apr 2011 14:51:48 +0200 (CEST) from Owen DeLong <owen () delong com>:

> The better solution to that problem is to get additional 6to4 relays deployed closer to India. Perhaps encouraging 
> Tata to take some leadership in that area, for example.
> I do not believe that the opening of the Comcast relays will harm BGP best path selection for the 6to4 prefix except 
> in rather broken and/or pathological cases of BGP best path selection. Those cases should be relatively easy to 
> identify and correct locally without preventing Comcast from significantly improving the 6to4 situation for the areas 
> they serve by opening their relays.
> I applaud John for his leadership in this area and I think the IPv6 work being done by Comcast sets a good example for 
> the community. As a Comcast customer, praising Comcast does not come easy to me, but, in this area, they are doing 
> excellent things and should be commended.
> Owen
>
> Sent from my iPad
> On Apr 19, 2011, at 10:26 PM, Bhoomi Jain <bhoomij () india com> wrote:
> > Mr. John,
> >
> > I thank you for asking the advice of the community.
> >
> > As our colleagues suggest, having 6to4 relays inside the network helps to reduce the latency.  Opening up your 
> > generous services to a larger Internet community by advertising the 192.88.99.0/24 BGP prefix outside the network 
> > could have extreme and unintended consequences.
> >
> > To give you an idea, a lot of the Internet in India depends on the service of the Tata companies, with international 
> > routing coming from Tata Communications AS 6453.  Announcing 192.88.99.0/24 to 6453 as a customer, I would worry 
> > about its treatment as BGP best-path, in place of closer 6to4 relays.  As you understand, these circuits are very 
> > far away, and also very full.  This is not something I would recommend.
> >
> > Sincerely,
> > Bhoomi Jain
> >
> > At 19 Apr 2011 22:51:24 +0200 (CEST) from "Brzozowski, John" <John_Brzozowski@[Cable.Comcast.com]>:
> >
> > > Folks,
> > > Since deploying our 6to4 relays, Comcast has observed a substantial
> > > reduction in the latency associated with the use of 6to4. As such we are
> > > contemplating further opening our relays for use by others. The
> > > availability of our 6to4 relays should improve the experience of others
> > > using 6to4 as a means to access content and services over IPv6.
> > > We have been open about our IPv6 activities and wanted to follow suit by
> > > reaching out to the community and soliciting feedback before moving
> > > forward. As always we wish to continue to advocate and support the
> > > universal deployment of IPv6.
> > > Please send any comments or questions to the list or if you wish to me
> > > directly.
> > > John
> > > =========================================
> > > John Jason Brzozowski
> > > Comcast Cable
> > > e) mailto:john_brzozowski@[[cable.comcast.com]]
> > > o) 609-377-6594
> > > m) 484-962-0060
> > > w) [[http://www.comcast6.net]]
> > > =========================================