Bell Canada outage?

Andree Toonk andree+nanog at
Wed Aug 8 20:31:58 UTC 2012

Further analysis shows that there were actually 107,409 prefixes
affected of 14,391 unique origin ASn's.

Interested if your prefixes was affected?
I've uploaded a list of prefixes and ASn's that were leaked here:


.-- My secret spy satellite informs me that at 12-08-08 12:50 PM  Andree
Toonk wrote:
> Hi,
> .-- My secret spy satellite informs me that at 12-08-08 11:35 AM  Darius
> Jahandarie wrote:
>> On Wed, Aug 8, 2012 at 2:31 PM, Zachary McGibbon
>> <zachary.mcgibbon+nanog at> wrote:
>>> Anyone at Bell Canada / Sympatico can tell us what's going on?  Our routing
>>> table is going nuts with Bell advertising a lot of routes they shouldn't be
>> Bell leaked a full table. To add to the fun, it seems that TATA took
>> the full table and releaked it.
> A quick analysis leads met to believe AS46618 ( Dery Telecom Inc) is the
> cause of this. AS46618 is dual homed to VIDEOTRON and Bell. What seems
> to have happened is that they leaked routes learned from VIDEOTRON to Bell.
> Based on BGP data I see that at 17:27 UTC  AS46618 ( Dery Telecom Inc)
> started to leak a 'full table', or at least a significant chunk of it to
> its provider Bell AS577.
> Bell propagated that to it's peers. Tata was one of the ones that
> accepted all of that.
> I can see that Bell propagated at least 74,109 prefixes learned from
> AS46618 to Tata. Tata selected 70,160 of those routes.
> Cheers,
>  Andree

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