Doug on 11 Aug 2012 23:03:12 -0700

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Re: [PLUG] race condition betwee modem and router

I guess it could just be traffic BUT I have never had a "keep alive" of any kind set up. Never needed it on my DSL.  Also if it were traffic I would think there would be at least some lulls. This is constant and fast blinking.  No I don't really think it is degrading my data rate but how would I know? Comcast doesn't tell you your data rate. Just a "well it should be UP TO some value"  If its crap coming in from the Internet then I guess I have to live with it but somehow I think it is just between the devices here. I don't see anything in my router logs or filter counters indicating any nefarious stuff coming in. Also when I ran the modem directly to the computer I had a solid light on the modem for the LAN / computer connection.


From: Art Clemons <>
To: Doug <>; Philadelphia Linux User's Group Discussion List <>
Sent: Sunday, August 12, 2012 12:25 AM
Subject: Re: [PLUG] race condition betwee modem and router

On 08/11/2012 11:12 PM, Doug wrote:
> The problem? is that there is constant data between the router and the
> modem. Both data lights blink continually. There is not data on the LAN
> while this is happening. I can even pull the LAN lines and I still see
> this constant data. I don't think I can http to the modem config page in
> this configuration.I would need to connect the computer directly to the
> modem.

Most of the time, you can connect to the modem through the router.  Most cable modems have an address like, and your router should pass you through to that address.  Look at your manual for the address.

I'm not sure that connecting to the modem will tell you what is going on, since I normally had to do that only when the modem for whatever reason had no working internet connection.

I'm not really sure you have a race condition though, cable modems show activity even when no IP traffic is passing, or at least every setup I've had or seen has done so.  Personally I'ld try one of the web100 sites (you need java functioning though) and see what my throughput was.  If it was relatively close to what was promised, I'ld forget the wan light activity and just use the system.

One difference  between cable and DSL though is that cable doesn't require a keep alive ping or other connection.  Most DSL modems shut down without through traffic after some set period of time.  I'ld look for some setting that is left over from DSL for keeping the connection alive if my throughput was down, if not, I'ld forget about the keepalive too.
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