[outages] Comcast Issues Central & East

[Joe Klein]

I know that Comcast's edge will block incoming traffic if a customer's 'modem' is offline.

That was an interesting support call once. The line was up and we could hit some stuff (on-net) from the location but off-net was dead and all traceroutes to them from off-net died one-two hops after crossing into Comcast. Power cycling the modem re-registered it with whatever database their edge uses to and sorted everything.



-----Original Message-----
From: Outages <outages-bounces at outages.org> On Behalf Of Rusty Dekema via Outages
Sent: Wednesday, July 31, 2019 12:01
To: Jordan Morris <jmorris at crosswindvoip.com>
Cc: outages at outages.org
Subject: Re: [outages] Comcast Issues Central & East

It is unclear to me whether this is related, but my Comcast "business"
(DOCSIS) line in southeast Michigan went completely down around 10:43 a.m., Eastern Daylight Time (UTC-4) this morning.

Comcast's website said that this was a known outage and gave an estimated restoration time of approximately three hours.

In reality, the service came back up around 10:55 a.m.

During the outage, the route to my /28 seemed to have been withdrawn from Comcast's internal network; traceroutes toward it from the Chicago area died within Comcast's network in the Chicago area. I was not physically present at the premises, so I was unable to determine whether this was a local / layer 1 / physical plant problem, or part of a wider problem.

-Rusty


On Wed, Jul 31, 2019 at 10:12 AM Jordan Morris via Outages <outages at outages.org> wrote:
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> Anyone else seeing issues with Comcast on the Central and East coast. We are seeing packet loss with on Comcast connections connecting to devices on the West coast. Getting lots of alerts for our monitoring on the West to Central but clean on our Central to Central monitoring.
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