[outages] Intermittent Comcast DNS issues from VT

[Frank Bulk]

Bill,

 

I believe Comcast has anycasted their DNS servers, so if you could provide a traceroute to each IP then if Comcast personnel are lurking they can better guess which one it is.

 

Frank

 

From: Outages [mailto:outages-bounces at outages.org] On Behalf Of Bill McGonigle via Outages
Sent: Friday, October 24, 2014 4:34 AM
To: outages at outages.org
Subject: [outages] Intermittent Comcast DNS issues from VT

 

Since about midnight (Eastern) Comcast's DNS (75.75.75.7[5,6]) has been giving timeouts and the occasional 'no route to host' from Vermont.   Switched our resolvers to use Google's Public DNS (via the same Comcast line) and all services returned to normal.

Packet traces aren't interesting (just outbound traffic, no responses) and traceroutes to the cdn usually succeed.  dns.comcast.net <http://dns.comcast.net>  reports no problems.  Queries at the command line sometimes succeed, sometimes fail, sometimes take a long time to finish.

-Bill

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