I have a Motorola modem SURFBoard SB4200, along with a wireless Linksys router that connects to that modem. The router works normally but the modem often dies and restarts itself after about 1-2 minutes.

What could be causing this problem? How should I start debugging it?

Could an excessive amount of network traffic be bringing down the modem? Are there any tools that can monitor the modem?

BTW, I use internet cable service provided by Comcast.

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2 Answers

there is a feature called 'IP Flood Detection' that needs to be disabled. (It is located under the Firewall page) By default, it is turned ON. When ON, this feature eventually causes everything to slow to a crawl and randomly reset modem. Turn it OFF (uncheck box) This is certainly a failing on Motorola's part to default a poor-functioning feature ON in the first place.

That sounds like an old modem from the DOCSIS 1.0 & 1.1 standard era from my search on your brand & model. DOCSIS 3.0 standard modems were released in August 2006, according to Wikipedia. You may be handicapped with that SB4200 modem and it is tripping up on new ISP protocol delivery standards, thus the constant reboot? A simple question to Comcast's tech support regarding DOCSIS 1.0 & 1.1 support in 2011 might shed light on compatibility issues or known problems. They should have a list of compatible modems as well, yet probably not a complete list.

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