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[ethirty]

Hi there,
I have searched the web to find the answer to this question and all I have come up with no real cause or solution.

The setup:
Time Warner Cable Internet Dynamic IP
DIR-655 A3 Firmware 1.21
3 hard wired, fully updated, virus free, windows xp pro machines

The Issue:
When only one PC is running or actively being used there is no issue.  However, when there is moderate internet usage on a second pc the internet connection will drop (the WAN light on the router stays on as does the ethernet light on the modem) and give this pair of log entries.

Code: [Select]

[INFO] Thu Jan 08 21:27:37 2009 WAN interface cable has been connected
[INFO] Thu Jan 08 21:27:35 2009 WAN interface cable has been disconnected

This message can be forced by running any internet based game on the first by and then opening playing a movie on netflix.  It will happen every time there is significant internet traffic on multiple pcs.

What I have tried:
Replaced with old netgear router no problems with the connection dropping connection.
Turned off all non essential options in the 655 (i.e. QoS, UPnP, Multicasting, traffic shaping, etc)
Reverted to old firmware versions to test.

Any insight?  Thanks in advance.

EDIT
The Cause?: Incompatibility between DIR-655 and the Motorola SB-4100 cable modem (or perhaps bad modem, but I could not replicate the issue with an old router).

The Solution:  Replace with newer modem.  I would suggest any DOCSIS 2.0 modem, I specifically used the Linksys CM100, but the D-Link DCM-202 seems like a good option as well.

[funchords]

On the Advanced - Advanced Network screen -- look for the "WAN Port Speed" setting -- set this to 100 Mbps.

Then -
Unplug power to the cable modem
Unplug power to the DIR-655
Restore power to the cable modem, wait 60 seconds for the modem to complete its link to the cable network
Restore power to the DIR-655

Now test it.  If this keeps the problem from happening, then the problem was that the unit did not automatically negotiate a good link with your modem.  Creating the manual setting resolved the issue.

[ethirty]

I switched it to 100Mbps and as soon as I put internet load on it it crashed with the same error.  I tried switching it down to 10Mbps and it was stable through all my tests, but capped my download speed (as expected).  I then switched it to manual 1000Mbps and it has been stable so far.  I will post again to update in a few days.  Thanks!

[EddieZ]

Just curious:
- are the ethernet cables CAT 5(E) or less?
- Are the cables and RJ45 plugs DIY or prefab?

The cause for this can also be in your PC's NIC/drivers. What's the make of your NIC's?

[thecreator]

I switched it to 100Mbps and as soon as I put internet load on it it crashed with the same error.  I tried switching it down to 10Mbps and it was stable through all my tests, but capped my download speed (as expected).  I then switched it to manual 1000Mbps and it has been stable so far.  I will post again to update in a few days.  Thanks!

Hi ethirty,

You haven't mentioned the Brand and Model Number of the Cable Modem. The D-Link DIR-655 Router comes with an Ethernet Cable. I used that Ethernet Cable when installing that Router, instead of the existing Ethernet Cable running between the Cable Modem and the Router. Have you replaced that Ethernet Cable with the Ethernet Cable packed with the Router?

[ethirty]

Thanks for all the responses folks.  So far so good.  With the WAN port set manually to 1000Mbps the internet has been up and stable for 14hrs+  I will update again if there is any further problem.

Just curious:
- are the ethernet cables CAT 5(E) or less?
- Are the cables and RJ45 plugs DIY or prefab?

The cause for this can also be in your PC's NIC/drivers. What's the make of your NIC's?

I am using the ethernet cable supplied with the router for the modem-router connection.  I have tried other cat 5e and cat 6 cables.  I have numerous cables at my disposal both DIY and prefabs.  I have tried a couple different cables and run all of them through the cable tester, and it seems to make no difference.  Additionally, the ethernet light on the modem never goes out, nor does the wan light on the router.

The NICs vary, I have tried both the built in Nvidia Nforce Gbit port as well as a realtek Gbit card.  The connection between the pcs and the router stays stable even when the "WAN cable is disconnected".

Hi ethirty,

You haven't mentioned the Brand and Model Number of the Cable Modem. The D-Link DIR-655 Router comes with an Ethernet Cable. I used that Ethernet Cable when installing that Router, instead of the existing Ethernet Cable running between the Cable Modem and the Router. Have you replaced that Ethernet Cable with the Ethernet Cable packed with the Router?

The modem is a Motorola Surfboard SB-4200 and I am using the cable packaged with the router, but have tried other cables.

[EddieZ]

Auto selection of connection indeed causes these errrors a lot (either on the NIC side or the modem side). Think you solved it

[ethirty]

Well, the problem persists.  Regardless of what setting I have the WAN port speed set at, it will still give me the WAN cable disconnected error.  Any further ideas?  I have checked the various cables and all test fine, including the one that came with the router.  My next thought is to try a different modem, but it is curious that this modem works fine with one of my old routers.

[funchords]

At the IP address, 192.168.100.1, the SB-4200 probably has some logs.  Can you copy and past the text of the logs here? 

[Lycan]

There appears to be a problem with connecting with that modem at 100 Mbps. The auto doesn't work cause the 100 doesn't work. It tries 1000, gets denied then moves to 100 and it connects, but then the 100 causes this dropping.

[ethirty]

Here is the modem log for the most recent loss

Code: [Select]

090112182153 5-Warning B605.10 Map Reject - Downstream Traffic Flow Not Mapped to BPI+ SAID (EC=8)
090112182153 4-Error B556.0 Received SA-Map Reject(4-B) error code 8
090112182153 7-Information B601.0 SA Map State Machine Started
090112182112 8-Debug F502.1 Bridge Forwarding Enabled.
090112182112 8-Debug M570.2 Motorola CM certificate present
090112182112 8-Debug M571.7 CM Cert Upgrade Enabled. AutoRun after Reg or via SNMP
090112182112 8-Debug I503.0 Cable Modem is OPERATIONAL
090112182112 7-Information B401.0 Authorized
090112182111 8-Debug F502.3 Bridge Learning Enabled.
090112182111 8-Debug B961.2 Retrieved CA Cert from Secure DL sector successfully
090112182111 7-Information B0.0 Baseline Privacy
090112182110 7-Information X518.9 Configuration - MMDMMD - Unit Update Enabled by CVC
090112182110 8-Debug I500.3 DOCSIS 1.1 Registration Completed
090112182110 7-Information I500.5 Attempting DOCSIS 1.1 Registration
090112182110 7-Information D509.0 Retrieved TFTP Config File SUCCESS
090112182110 7-Information D507.0 Retrieved Time....... SUCCESS
************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS
************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1
************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day
************ 7-Information T500.0 Acquired Upstream .......... SUCCESS
************ 8-Debug T503.1 Acquire US with status OK, powerLevel 51, tempSid 2326
************ 8-Debug T505.0 Acquired Upstream with status OK
************ 7-Information T501.0 Acquired Downstream (711000000 Hz)........ SUCCESS
************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 711000000, US Id 3
************ 7-Information I510.0 *** BOOTING *** SB4200-1.4.9.2-SCM01-NOSH

And here is the router log

Code: [Select]

[INFO] Mon Jan 12 17:21:01 2009 Bringing up WAN using DHCP
[INFO] Mon Jan 12 17:21:01 2009 WAN interface cable has been connected
[INFO] Mon Jan 12 17:21:00 2009 WAN interface cable has been disconnected

The modem is 1hr off as you can tell by the time.  If this is any help great, if not I can call timewarner and request a new modem.

[funchords]

Good catch! 

If you didn't initiate that modem reboot manually, then try swapping the modem.  Even if the LAN side was flaky, it shouldn't have rebooted like that.

[Lycan]

Ask for the RCA RCM-425. Best modem Time warner offers.
They wanted to give me the newer Motorola, I hooked it up and immediately had problems.

[ethirty]

Just got off the phone with Timewarner and they said the modem seemed fine (right...) and blamed it on the router as I cannot get it to reset on command without the router in place, so I will grab one of the linksys CM100 modems from the office and give it a try.  If it works any reason not to keep the CM100 permanently?

[davevt31]

You will have to tell TW that you are switching modems as they give out IP's by the MAC address of the modem.