[139823] in North American Network Operators' Group
Re: Comcast's 6to4 Relays
daemon@ATHENA.MIT.EDU (Owen DeLong)
Wed Apr 20 15:36:48 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <20110420163320.E4B9D4389C@smtp03.zmail.com>
Date: Wed, 20 Apr 2011 12:32:50 -0700
To: Bhoomi Jain <bhoomij@india.com>
Cc: NANOG <nanog@nanog.org>, "Brzozowski,
John" <John_Brzozowski@Cable.Comcast.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
1. Yes.
2. Perhaps, but, it's minimal internal risk and the risk it poses =
to others
can be mitigated by those others installing appropriate services
on their own networks.
3. We agree here as well.
Owen
On Apr 20, 2011, at 9:33 AM, Bhoomi Jain wrote:
> Mr. Delong,
>=20
> 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.
>=20
> Sincerely,
> Bhoomi Jain
>=20
> At 20 Apr 2011 14:51:48 +0200 (CEST) from Owen DeLong =
<owen@delong.com>:
>=20
>>=20
>> 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
>>=20
>> Sent from my iPad
>> On Apr 19, 2011, at 10:26 PM, Bhoomi Jain <bhoomij@india.com> wrote:
>>> Mr. John,
>>>=20
>>> I thank you for asking the advice of the community.
>>>=20
>>> 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.
>>>=20
>>> 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.
>>>=20
>>> Sincerely,
>>> Bhoomi Jain
>>>=20
>>> At 19 Apr 2011 22:51:24 +0200 (CEST) from "Brzozowski, John" =
<John_Brzozowski@[Cable.Comcast.com]>:
>>>=20
>>>>=20
>>>> 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
>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>>> 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]]
>>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>>>=20
>>>>=20
>>>>=20
>>=20
>>=20
