XO/AS2828 -> Cogent/AS174 blackholing

Tore Anderson tore.anderson at redpill-linpro.com
Mon Nov 22 14:19:22 CST 2010

Problem solved.  The culprit turned out to be a Cogent router in Dallas.

Many thanks to Jason Beasley from XO for helping out with
troubleshooting and escalating the issue.

* Tore Anderson

> I'm seeing blackholing on my inbound traffic from XO and their
> downstreams (notably CNN) via Cogent.  Prepending towards Cogent changes
> my inbound path from 2828 174 39029 to 2828 3549 3292 39029 and it
> works fine, even though the outbound path is still via Cogent:

Tore Anderson
Redpill Linpro AS - http://www.redpill-linpro.com/
Tel: +47 21 54 41 27

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