I help manage a network for a small private elementary school and our internet connection is through Spectrum using an Arris Touchstone DG1670A modem. The problem is that several times throughout the day we lose connection to the Internet. I have set up several pings to internal systems and Google (8.8.8.8) and when the connection gets flaky, the internal pings are all OK but the Google one gets slower and slower until it finally starts to drop packets.
After a few minutes (5-15) the connection comes back and everything is fine. Until it happens again. There doesn't seem to be a particular cause for the Internet connection to go down, it just happens randomly throughout the day.
Our Internet connection is 300/30 but I never see anything approaching that on our firewall. Most of the time our traffic is <150MB down and <15MB up. Our ISP says that everything is fine with the modem (it's been changed out 3 times) and the line looks good. However, the service guy says when the outage occurs the modem stops logging bandwidth and other metrics.
My question is, how do I debug this problem? Is there a bad packet somewhere on the network? Are we just generating too much sustained traffic and causing the modem to freak out? Are these Arris modems known to have these types of issues?
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