I've documented this as clearly a Comcast core network equipment issue, but Comcast is putting me through the usual parade of redundant and irrelevant support processes.
They've checked my new SB6141 modem and found / fixed overly high signal to the house, which has nothing to do with the problem.
I have a ping to a google server running continuously now and have graphed it, which clearly shows the lag spikes beginning at 8:40PM and ending at 5:40AM. I've also done traceroutes during the outage, which show the packets dropping at a specific Comcast core router (pos-0-4-0-0-pe01.529bryant.ca.ibone.comcast.net).
Here is a link to a log scale plot of ping during the outage last night:
http://i40.tinypic.com/dqhkl4.jpg
I've e-mailed to:
we_can_help@comcast.com
comcast_cares@comcast.com
comcast_customersupport@cable.comcast.com
the local support supervisor
I've also spent about 30 hours on chat and phone with the support center in Cebu, Philippines. i've posted all of my data to the comcast forum at forum.comcast.com:
http://forums.comcast.com/t5/Basic-Internet-Connectivity-And/Intermittent-lag-high-ping-traced-to-a-Comcast-core-router/m-p/1758799#M180688
At this time, the local supervisor sent me e-mail that they will be escalating to the Network team on Monday, which might mark the beginning of actual support on this issue.
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