backbones filtering unsanctioned sites

Jean-Francois Mezei jfmezei_nanog at
Thu Feb 16 20:52:54 UTC 2017

On 2017-02-16 14:59, Sadiq Saif wrote:

> From -

Many thanks.

pardon my ignorance here, but question:

For an outfit such as Cogent which acts not only as a transit provider,
but also edge provider to large end users, can it easily implement such
a court order to block only edge interfaces and not to its transit

(aka: propagate null routes for only to interfaces that
lead to end users, but leave core/GBP aspects without the block.)

Or is BGP and any internal routing protocols so intermingled that it
becomes hard to manage such blocks ?

The difficulty for network to block traffic becomes an important
argument when trying to convince governments that blocking should not be
done. (ex: Québec government wanting to block access to gambling sites
except its own).

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