Comcast's 6to4 Relays

Matthew Petach mpetach at
Wed Apr 20 03:00:53 UTC 2011

On Tue, Apr 19, 2011 at 7:26 PM, Bhoomi Jain <bhoomij at> 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 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 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

On the contrary; I think Comcast announcing their 6to4 relays
through TATA could be just the incentive the Internet needs to
kick the 6to4 habit completely, and decide once and for all
the only sane option is dual-stack native.  ;-)


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