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