Ideally, your log should be boring and you should see very little activity other than the time it boots up, a rare error here or there (because no system is perfect and your modem will occasionally fail to connect), or a rare bit of downtime because your ISP pushed out new firmware. If you see a lot of timeout-related errors where the log indicated that the modem has lost connection (often called T3 and T4 errors), that’s a problem. If you see power resets that weren’t caused by you physically resetting the device, that’s a problem. What you don’t want to see in this log is a bunch of error codes that don’t make sense. The log clearly shows that roughly a day and a half ago, the modem was restarted do to a power reset (which we initiated by physically unplugging it), after which there is a MIMO Event (which looks scary because the priority code is “warning” but it’s actually just our modem talking to the cable provider as part of a IP configuration/provisioning routine).
In those cases, you need to peek into the modem to see what’s going on. By accessing the tiny little web server hidden inside your modem and reading the diagnostic pages, you can learn a ton of things about your modem and connection like general status, signal strength, and event history via the system log. While we all tend to over-focus on the router as the source of potential problems, oftentimes the modem (or the line it’s connected to) can be at fault. Or maybe your internet connectivity drops out intermittently and no amount of tinkering with your router has solved your problems. So why look at the diagnostic page and logs of your cable modem in the first place? Think of this familiar scene: something weird is going on with your internet access, so you dutifully unplug your modem and router, start them back up, and things work well again…for a spell. RELATED: How to Troubleshoot Your Internet Connection, Layer-By-Layer While some people do occasionally peek at the control panel of their router, very few people ever look at their modems–or even realize they can do so.
Unbeknownst to most people, cable modems (and other broadband modems) have diagnostic and logging functions built in, just like routers. Although unknown to and ignored by most people, cable modems have a diagnostic that can help you troubleshoot connection problems.
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