[Dshield] Cogent / Level 3

Brenden Walker BKWalker at drbsystems.com
Fri Oct 7 15:58:25 GMT 2005

> -----Original Message-----
> From: list-bounces at lists.dshield.org 
> [mailto:list-bounces at lists.dshield.org] On Behalf Of John Hardin
> Sent: Friday, October 07, 2005 11:35 AM
> To: General DShield Discussion List
> Subject: Re: [Dshield] Cogent / Level 3
> On Wed, 2005-10-05 at 09:28, Sean Waddell wrote:
> > Not sure if this is appropriate for this list, but wanted to see if 
> > anyone has any other information.  This morning Level 3 
> de-peered with 
> > Cogent (according to Cogent Tech Support).
> >From the discussion I've seen (i.e. L3 and Cogent customers *cannot
> communicate at all*) it sounds like L3 is dropping traffic 
> from Cogent's netblocks at their boundaries.
> I mean, simply de-peering shouldn't totally terminate all 
> connectivity between L3 customers and Cogent customers, 
> should it? One of the great appeals of this intarwebnet 
> thingy is that it routes around outages, right? L3 *can't* be 
> Cogent's *only* upstream provider, right? :)

If I'm not horribly mistaken, there is no upstream from Cogent and
Level3 as they're on the top of the heap. But it does appear that Level3
is dropping anything destined for Cogent.

I know from my RoadRunner cable modem (Level3) I can't browse to

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