Are you connecting to the cable modem through a router, or directly from the C840's Ethernet connector to the cable modem?
If it's the latter, you'll need to power the cable modem off for about five minutes, then turn it back on and wait for the cable system to synchronize with the cable modem. Then connect the Ethernet cable from the C840 to the cable modem, and restart the C840.
Cable modems are configured to retain the MAC (hardware Ethernet) address of the last connecting device. If that address changes because a different device has been connected, the cable modem will not service the new device until the cable modem has been powered off.
Thanks for the information. In that configuration, we need to focus on the C840 setup. First, is the Ethernet cable connecting the C840 to the router known good? Do the LEDs on the C840 next to the RJ-45 Ethernet connector show a connection and traffic?
What operating system is the C840 running? Does the internal network adapter appear in the list of network adapters in the device manager? Is the network adapter set up to "obtain an IP address automatically" from the router? Does it in fact obtain one? You can find that out by opening a cmd.exe window (Start/Run cmd.exe), and in the window that opens, type
ipconfig /all. What IP address is listed for the network adapter? Is it correct for the IP address setup for the LAN?
Has the C840's network adapter ever worked correctly? If it has, do you recall what changes were made just before the adapter stopped working correctly?
Should I do a 'release' and 'renew' with ipconfig?
Brian,
Before you do, open a cmd.exe window and take a look at the current IP address with
ipconfig /all. If it begins with 169.254, then the machine is attempting to obtain an IP address via DHCP, but isn't succeeding and is falling back to a "locally assigned" IP address. Try releasing and renewing the IP address, but if the current one begins with 169.254, the chances of success are slim.
Can you try this:
ping 127.0.0.1 from a cmd.exe window. That will tell us if IP networking's functioning to the card...but not through it.
How do the indicators next to the RJ-45 connector look? Any signs of light there?
(edit) You may find the link listed below labelled "Troubleshooting TCP/IP Connectivity with XP" helpful in figuring this out.
I agree with your "to but not through" analysis. From the C840 service manual, it appears that the modem device is a
daughtercard. I didn't find any specifics on the Ethernet device, but I suspect it's integrated directly on the motherboard. This
page of the service manual illustrates the difficult-looking task of disconnecting the network cable from the system board.
Given the failure mode (no signal getting in or out), the likely culprit is that connection...unfortunately!
Also note that the 1394 device is the Firewire interface, and isn't part of the problem unless XP's "Network Wizard" constructed a "bridge" involving the 1394 device. If it did,
remove the bridge.
I hooked up my cable modem to it today, and there are no lights at the connection to tell me that the adapter is good.
In Network Connections I have a '1394' connection which shows 'Connected'
The 'Local Area Connection' shows 'Network Cable Unplugged' even with the cable plugged in (I also checked to see if the connection was loose but it is not)
Are the modem and ethernet card on the same piece of internal hardware, and if so, can the ethernet card part go bad and the modem part still be good?
When I ping 127.0.0.1 I get a result of 4 packets sent and received and 0 lost
I do not have any experience with networks (they are beyond my pay scale) but unless I am mistaken that means that there is a connection to the card but not through it?
jwatt
4.4K Posts
0
January 28th, 2005 16:00
Are you connecting to the cable modem through a router, or directly from the C840's Ethernet connector to the cable modem?
If it's the latter, you'll need to power the cable modem off for about five minutes, then turn it back on and wait for the cable system to synchronize with the cable modem. Then connect the Ethernet cable from the C840 to the cable modem, and restart the C840.
Cable modems are configured to retain the MAC (hardware Ethernet) address of the last connecting device. If that address changes because a different device has been connected, the cable modem will not service the new device until the cable modem has been powered off.
Jim
Brian Gotjunk
15 Posts
0
January 29th, 2005 12:00
jwatt
4.4K Posts
0
January 29th, 2005 16:00
Thanks for the information. In that configuration, we need to focus on the C840 setup. First, is the Ethernet cable connecting the C840 to the router known good? Do the LEDs on the C840 next to the RJ-45 Ethernet connector show a connection and traffic?
What operating system is the C840 running? Does the internal network adapter appear in the list of network adapters in the device manager? Is the network adapter set up to "obtain an IP address automatically" from the router? Does it in fact obtain one? You can find that out by opening a cmd.exe window (Start/Run cmd.exe), and in the window that opens, type ipconfig /all. What IP address is listed for the network adapter? Is it correct for the IP address setup for the LAN?
Has the C840's network adapter ever worked correctly? If it has, do you recall what changes were made just before the adapter stopped working correctly?
Jim
Brian Gotjunk
15 Posts
0
January 29th, 2005 21:00
The cable is good because it works on other computers in the office.
Win XP 2
Card appears in Device Manager
I brought the machine home for the weekend so not able to check to see if the IP address is correct, but it is setup to 'obtain automatically'
The machine came from another office - but I don't know if it worked here before I started using it.
Should I do a 'release' and 'renew' with ipconfig?
jwatt
4.4K Posts
0
January 29th, 2005 22:00
Brian,
Before you do, open a cmd.exe window and take a look at the current IP address with ipconfig /all. If it begins with 169.254, then the machine is attempting to obtain an IP address via DHCP, but isn't succeeding and is falling back to a "locally assigned" IP address. Try releasing and renewing the IP address, but if the current one begins with 169.254, the chances of success are slim.
Can you try this: ping 127.0.0.1 from a cmd.exe window. That will tell us if IP networking's functioning to the card...but not through it.
How do the indicators next to the RJ-45 connector look? Any signs of light there?
(edit) You may find the link listed below labelled "Troubleshooting TCP/IP Connectivity with XP" helpful in figuring this out.
Jim
Message Edited by jimw on 01-29-2005 05:54 PM
jwatt
4.4K Posts
0
January 31st, 2005 17:00
I agree with your "to but not through" analysis. From the C840 service manual, it appears that the modem device is a daughtercard. I didn't find any specifics on the Ethernet device, but I suspect it's integrated directly on the motherboard. This page of the service manual illustrates the difficult-looking task of disconnecting the network cable from the system board.
Given the failure mode (no signal getting in or out), the likely culprit is that connection...unfortunately!
Also note that the 1394 device is the Firewire interface, and isn't part of the problem unless XP's "Network Wizard" constructed a "bridge" involving the 1394 device. If it did, remove the bridge.
Jim
Brian Gotjunk
15 Posts
0
January 31st, 2005 17:00
Jim,
I hooked up my cable modem to it today, and there are no lights at the connection to tell me that the adapter is good.
In Network Connections I have a '1394' connection which shows 'Connected'
The 'Local Area Connection' shows 'Network Cable Unplugged' even with the cable plugged in (I also checked to see if the connection was loose but it is not)
Are the modem and ethernet card on the same piece of internal hardware, and if so, can the ethernet card part go bad and the modem part still be good?
When I ping 127.0.0.1 I get a result of 4 packets sent and received and 0 lost
I do not have any experience with networks (they are beyond my pay scale) but unless I am mistaken that means that there is a connection to the card but not through it?