Equipment (Modems,Gateways)
Modems, Gateways, and Networking Devices
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Netgear CG3000DCR UPnP M-SEARCH with high MX bug

Yesterday we spend all day debugging our network as we had strange "outages" of 1-3 seconds on our Comcast Netgear CG3000DCR router with Firmware version V3.01.05.

 

It turns out that our software sends a UPnP M-SEARCH broadcast on the network with an MX of 5 (according to the UPnP specs a devices should respond with a unicast UDP package between 0 and 5 seconds).

The Netgear router IS responding in 0-5 seconds but instead of continuing to process other requests on the network, it STOP ALL PROCESSING and halts all traffic for that time!

This can be even seen when a user hits "Refresh" in the "Network" section of Windows Explorer. Windows sends an M-SEARCH with a MX of 3. This causes the router to "only" pause processing between 0 and 2 seconds but its still noticable when pinging the router.

an MX of 1 or zero does not cause the router to pause as it immediately responds to the M-SEARCH request.

 

Is there a later firmware that fixes this problem?

 

I do know that the SMC and the Cisco Router do NOT show this behavior.

 

Chris Muench

C-Labs

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