[clug] Troubleshooting PPPOE [SEC=PERSONAL]

Roppola, Antti - BRS Antti.Roppola at brs.gov.au
Wed Apr 8 23:55:28 GMT 2009

We've been having similar issues at home and a relative has been having
issues as well. Relative called the ISP who confirmed that there had
indeed been some sort of issue (nothing posted on their home page).

For the last few weeks, some issues with gmail timing out. More
recently, logs full of hangups. This is with IPCop and also with a Dlink
device (so I don't think it's OS related).



-----Original Message-----
From: linux-bounces+antti.roppola=brs.gov.au at lists.samba.org
[mailto:linux-bounces+antti.roppola=brs.gov.au at lists.samba.org] On
Behalf Of Christopher Giffard
Sent: Thursday, 9 April 2009 9:29 AM
To: linux at lists.samba.org
Subject: [clug] Troubleshooting PPPOE

Hello all! :)

Recently I've been experiencing quite frequent intermittent dropouts on
my VDSL line - and I'm having trouble diagnosing the cause.

My suspicions currently point to the ISP - the problem initially
appeared a few weeks ago as a strange inability to view websites which
were hosted on servers that blocked certain kinds of ICMP traffic, like
microsoft.com. Setting the MTU on the ppp interface to 1400 fixed the
issue - only for a short time before it would fail to load those sites
again, and I'm still not entirely sure why.

This week the connection started to drop out. It wasn't too frequent on
monday - twice a day - but this morning it's dropped out five or six
times in the last hour, and I'm manually having to ssh into the gateway
to restart pppd. I'm sure that there's something wrong with the ISP's
PPPOE server - the ping latency often peaks at well over a second now,
where it used to stay fairly solidly at 2 - 10ms. I've extracted pages
and pages of this kind of thing from syslog:

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