modem not talking to ethernet port

click up a CMD termainal, ipconfig /release /all Remove power from cable modem for 15 seconds by your clock. remove your ethernet and usb cable from modem. Power up cable modem, wait for leds to return to normal. Plug in ethernet cable.

ipconfig /renew

try doing a ping http://192.168.100.1 That is a web page server in Motorola SB4xx or SB5xx cable modem. if works, you can talk at the cable modem on ethernet.

I'm having what I think is the same problem. I've repeatedly done all

of the renew, ping, and power off/on routines that you mentioned and

many more. I'm now to the point where I can get a connection, but it

doesn't last for long, and will "flicker" off and on. The LAN status

still shows "Connected," but I can't always pull up a web page. I've

tried multiple ethernet ports (one attached to the motherboard and one

on a PCI card), multiple ethernet cables, multiple modems, and

with/without a router. I do not have the Windows firewall turned on,

but have tried both with/without my Norton firewall. Since the problem

continues regardless of the hardware, I'm convinced that it has

something to do with software/settings on my computer, but I have no

idea where to start. I thought it might be the firewall settings, but

it continues even when that is turned off. Actually, if I remember

correctly, I get a different message when the router is taken out of

the mix - it says that there is "Limited or no connectivity" and it

cannot find my IP address. I went to the web page that you mentioned

and found the following log entries - do these give any indication of

what might be going on? (My current hardware is a Motorola SB5100

cable modem and a Linksys BEFSX41 broadband firewall router.)

2005-04-13 19:13:32 5-Warning 0x03F000DE Map Reject - Downstream

Traffic Flow Not Mapped to BPI+ SAID (EC=8)

1970-01-01 00:00:13 3-Critical 0x040D9A2C DHCP WARNING - Non-critical

field invalid in response.

2005-04-13 18:04:25 5-Warning 0x03F000DE Map Reject - Downstream

Traffic Flow Not Mapped to BPI+ SAID (EC=8)

1970-01-01 00:00:13 3-Critical 0x040D9A2C DHCP WARNING - Non-critical

field invalid in response.

1970-01-01 00:00:30 3-Critical 0x04E33948 No Ranging Response received

- T3 time-out

1970-01-01 00:00:19 3-Critical 0x04E339AC Init RANGING Critical Ranging

Request Retries exhausted

1970-01-01 00:00:19 3-Critical 0x04E33948 No Ranging Response received

- T3 time-out

1970-01-01 00:00:13 3-Critical 0x040D9A2C DHCP WARNING - Non-critical

field invalid in response.

1970-01-01 00:00:10 3-Critical 0x040D9964 DHCP FAILED - Discover sent,

no offer received

1970-01-01 00:00:10 3-Critical 0x040D9A2C DHCP WARNING - Non-critical

field invalid in response.

1970-01-01 00:00:16 3-Critical 0x040D9A2D DHCP FAILED - Critical field

invalid in response

1970-01-01 00:00:15 3-Critical 0x040D99C8 DHCP FAILED - Request sent,

No response

2005-04-05 07:01:27 5-Warning 0x040DC13C DHCP RENEW WARNING - Field

invalid in response

I haven't checked again recently, but these problems did not occur with

my USB port. However, I want to use the hardware firewall, and this is

only possible with an ethernet connection. Any help with this would be

appreciated.

If your modem leds are looking normal and you can get to the cable modem web page your 90% doing good. If the top leds are not on solid you have cable signal problems. The other problem maybe signal levels.

If you can ping 66.94.234.13, you are connected to the internet and doing 99% good. If that ping works and ping yahoo.com fails, your DNS servers are AFU.

Since I do not do windows, I cannot help you.

Next chance you get, download a knoppix iso and burn to cd. boot cd set dhcp on ethernet and use a public dns server.

If that stays on solid, you know it is software.

Always helps to get a second opinion to rule out hardware.

Anytime you change the hardware connected to the cable modem, you have to power reset the cable modem at least 15 seconds just to talk to the modem.

Those are normal on a booted cable modem. You need to show your up/down stream signal values to rule cable modem connectivity.

You have to get to known state to trouble shoot your problem. Get the knoppix to rule out hardware and software.

Well if USB works SOLID, that indicates the cable modem connection is working.

Does not rule out ethernet port side of modem.

I hear that. Viruses are trying to disable those. :(

Buy or get a friend to burn a knoppix cd to help you rule out hardware problems.