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[ethirty]

Ok, just an update.  I plugged in the linksys cm100 and called TW with the MAC address.  So far so good.  It used to be a sure bet that it would disconnect shortly after loading netflix on demand, but I have netflix running on two pcs currently as well as constant bandwidth tests running on the third. 

I suspect it was some incompatibility between the Motorola SB-4100 and the DIR-655, as I could not replicate the issue with an old netgear router and the same modem.

If the problem comes back I will post again, but I think we are out of the woods.
Thanks for all the help folks.
 

[Crazy Bull]

I had this exact problem with Time Warner Cable, a Motorola SB5101 modem, and the DLink DIR_655.

TWC came out and checked the cable signal and said everything was fine (as they always do).  However, the problem continued to occur.  So I contacted Motorola Tech Support and they had me access the SB5101 admin page (just enter the modem's IP address in your browser's URL box).   Then click on the Signal button.  The web page will display the downstream signal strength. In my case, it was -11 dbmV.   While within spec for the SB5101 (-15 dbmV to +15 dbmV), Motorola Tech Support said they much prefer to see the number closer to zero.   

The tech support guy asked if there were any splitters between the incoming line and the modem.   In my case there was one to split the incoming signal between internet and TV distribution.   He suggested I remove that and see if the problem went away.   So as an experiment, I bypassed the splitter and re-measured the signal strength via the SB5101 admin page.  The signal strength was now at -6 dbmV which means the signal was over 3 X stronger.   With that change I had no more dropped connections.   However, I also had no cable TV since I had eliminated the splitter.

So I purchased a cable booster with support for an internet connection (you have to be able to communicate upstream).   Once installed, the signal strength to the SB5101 measured +6 dbmV, which means the signal is now 6 X stronger than when I started.   And as an added better, I have a crisper picture on my TV's. 

So it isn't necessary to buy another cable modem, just boost the signal strength to the one you have, and the dropped connectivity problem should go away.

[FurryNutz]

Also recommend to remove any and all TV line splitters if possible or use just one and make it a good quality one.

[jonkelew]

Now i have same problem :/, WAN interface cable has been disconnected then WAN interface cable has been Conntected ( 2 sec delay)

i got same router but i do got a Zyxel prestige 660h tripleplay, i have been using these 2 for a long time but 1 week ago it started to struggle, i restarted the units and then the WAN did keep its uptime abit longer ( 12-24 hours), then it returns to 2-10 min WAN drops -_-.

[FurryNutz]

Try setting the WAN Connection Interface speed.
Try swapping out for a know good cable, recommend CAT6. Shortest length possible. I use a 1footer.

[jonkelew]

have tried that, didnt help and i am using a CAT 5e cable between the modem and the router

[FurryNutz]

The router is probably reporting and functioning as designed when this happens. I would remove the router and connect one PC to the ISP modem and view the network status for the PC while connected to the ISP modem and see if it reports the same thing. I'm wondering if the ISP modem is losing connection or something on the ISP modem is intermittently stopping the connection.

[jonkelew]

i will try that soon when i get the chance, also i did send a email to Telia (my internet provider) about this too

[FurryNutz]

Might try a different ISP modem too. 

[jonkelew]

well i dont got another Modem to test with, but i guess if i try without the router and the problem still persist then replace the Modem would be the next option.

[FurryNutz]

Let us know how it goes.

[ashmund]

Hey Furry, I think this is the problem I am getting on my router. Every time my router reboots as I was telling you, I get this exact message in my logs.

[INFO]   Sun Jul 03 02:22:37 2011   Above message repeated 1 times
[INFO]   Sun Jul 03 02:22:34 2011   Estimating speed of WAN interface
[INFO]   Sun Jul 03 02:22:33 2011   Obtained IP Address using DHCP. IP address is 173.210.144.145
[INFO]   Sun Jul 03 02:22:25 2011   Bringing up WAN using DHCP
[INFO]   Sun Jul 03 02:22:25 2011   WAN interface cable has been connected
[INFO]   Sun Jul 03 02:22:24 2011   WAN interface cable has been disconnected
[INFO]   Sun Jul 03 02:22:19 2011   Bringing up WAN using DHCP
[INFO]   Sun Jul 03 02:22:19 2011   WAN interface cable has been connected
[INFO]   Sun Jul 03 02:22:17 2011   WAN interface cable has been disconnected

[FurryNutz]

This could be the result of the ISP SAT modem loosing connection and the router is reporting it as such, thus seemingly making it look like it's the routers problem.
Can you check any logs or status of the ISP modem and see if there has been any connection issues during this time frame?

[jonkelew]

ok, i am directly conntected to the modem (zyxel prestige 660H), no problem so far but, i have to stay connected for a while, cant access the logs on modem :/ there is none when i check

EDIT: kk 3 hours now connected to the modem, stable most of the time except some timeouts with a 10-20 min interval. i am using cmd to ping all time.

[FurryNutz]

What are these time outs?