[RndTbl] Shaw Internet stops working for an hour or so

[Sean Walberg]

Do you have an arp entry for your next hop gw when its down?  What's
the link status reported by ifconfig? Errors?  Tcpdump the interface,
do you see anything at all? (Normally you should see a lot of arping,
at least on the residential side)

Sean

On 2/19/07, Bill Reid <billreid at shaw.ca> wrote:
> I am seeing a problem with Shaw Business Internet that has me puzzled.
>
> I have a Linux server connected to the Shaw DOCSIS cable modem. It has been
> running without problems until Shaw did some "network upgrades" on Jan 11.
> Since
> then the Internet goes away for 1-2 hours every day or so. Initially I
> thought
> it was Shaw's problem and they sent techs out twice. They adjusted the
> signal
> levels but the problem still persisted. Power cycling the modem does not get
> the
> interface working. Doing a network restart on Linux does get it going again.
> The
> box has two interfaces and the problem only occurs with the Internet
> interface.
> I have swapped the interface without any change. The network interfaces also
> use
> different drivers.
>
> When the interface is down Shaw can still connect to the modem. It would
> appear
> that the stopping and starting of the interface is a Linux issue.
>
> I remember a discussion on the list a while ago about a similar problem with
> the
> thought that it was related to Shaw's DHCP server. I am using a static IP so
> maybe the problem is something else.
>
> The symptoms would suggest that some network activity is causing the
> Ethernet to
> shut down. How it gets going again is not clear. There are no messages in
> syslog
> when the interface stops or starts.
>
> My next thing to try is to use something like a Linksys router.
>
> -- Bill
> _______________________________________________
> Roundtable mailing list
> Roundtable at muug.mb.ca
> http://www.muug.mb.ca/mailman/listinfo/roundtable
>
>


-- 
Sean Walberg <sean at ertw.com>    http://ertw.com/