[Outages-discussion] RoadRunner/Bright House cablemodem problems

[Frank Bulk]

Is this a Motorola gateway or cable modem?  Non-gateway cable modems
typically have just one Ethernet port.  How do you know it reboots versus
doing a T4 reset because of communication issues?

Frank

-----Original Message-----
From: Outages-discussion [mailto:outages-discussion-bounces at outages.org] On
Behalf Of Jay Ashworth
Sent: Monday, September 16, 2013 3:11 PM
To: outages-discussion
Subject: [Outages-discussion] RoadRunner/Bright House cablemodem problems

On a new install for a client, we're seeing that the cable modem drops
out on us, and in a very interesting way.

Every so randomly often, it apparently does an uncommanded reboot (this
according to a guy who was logged into the CMTS looking at it one time it
did so), and when it does, 2 connected devices see the ethernet drop for 3-5

seconds, come back up for 15, then drop again for 3-5, and then go back 
to normal.  I see this behavior logged exactly to the second on both the
attached Fortigate router and my Linux laptop; we've replaced the cable
modem and the ethernet cables coming out of it.

Oddly, it only seems to happen when there's traffic on the link; I haven't
seen a drop get logged when the link is idle (overnight/weekends).

The cablemodem is a DOCSIS3, Motorola Surfboard Extreme (that's not exact, 
but I can provide a model number if anyone thinks it's critical).
Everything
in the cage is on a brand new 2000VA UPS.

Anyone ever seen a cablemodem misbehave in this particularly peculiar way
before?

Cheers,
-- jra
-- 
Jay R. Ashworth                  Baylink
jra at baylink.com
Designer                     The Things I Think                       RFC
2100
Ashworth & Associates     http://baylink.pitas.com         2000 Land Rover
DII
St Petersburg FL USA               #natog                      +1 727 647
1274
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