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Windows Forum / Windows XP / Networking and Web / December 2006Transmitting but Not Receiving Packets on NIC
Trying to get a friend's PC working with Comcast high speed internet at home via cable modem. Having some strange software issue with the PC. I installed a known, working NetGear NIC and related drivers in the Gateway PC that is running Windows XP SP1. (I had to install this NIC because the onboard Intel NIC with latest drivers was "flapping" - would continuously go between "enabled" and "disconnected" states). Windows shows the status of the NetGear LAN Connection as "Enabled" and the link light LED is green and showing activity. However, the NIC statistics show that packets are being transmitted but "0" packets are being received. I had Ethereal running on the PC and it shows the DHCP Discover packets being transmitted (reflected in statistics) and other DHCP broadcasts for other MAC addresses. I plugged 2 other PCs into the cable modem and both obtained IP addresses right away. Therefore I know that Comcast service is working properly and providing addresses via DHCP. I know this is strange but my guess is that there is some software that is installed on the PC that is preventing packets from being received by the NIC. I tried uninstalling AOL, Norton AV, and Spy Sweeper software and still saw the problem. I also tried enabling/disabling the windows firewall. At this point I've run out of ideas and asking for help from anyone out there that has seen this problem before or may have other ideas. Thanks, Z > Trying to get a friend's PC working with Comcast high speed > internet at home via cable modem. Having some strange software [quoted text clipped - 30 lines] > Thanks, > Z When you plugged the other computers into the cable modem, did you use the same cable? This sounds like it might be a bad cable. -- John Yes, I used the same cable. So I know the cable is good. > > Trying to get a friend's PC working with Comcast high speed > > internet at home via cable modem. Having some strange software [quoted text clipped - 35 lines] > > -- John > John Wunderlich wrote: >> [quoted text clipped - 31 lines] >>> >>> Thanks, Z >> When you plugged the other computers into the cable modem, did you >> use the same cable? This sounds like it might be a bad cable. >> >> -- John > Yes, I used the same cable. So I know the cable is good. At this point, I'm out of clues. As a despiration measure, you might try the LSP fix program. Check out the following website and see if this tool might fix your problem... (couldn't hurt)... <http://cexx.org/lspfix.htm> HTH, John Just an update on this issue. I put a hub in-line between the PC and cable modem. Then using a second PC I was able to use Ethereal to take a packet capture. What I found was that Comcast was not sending a DHCP Offer in response to the PC's DHCP Discover. Previously I had assumed that Comcast was sending this since my laptop worked when I plugged it in. Therefore the problem was with Comcast's network and not the PC. Anyways, the solution to the problem was simple. Comcast remotely reset the cable modem and subsequently the DHCP exchange worked normally. Wish I had thought of this previously but I was too focused on the PC. Thanks to John for his help. Thanks, Z > >>> Trying to get a friend's PC working with Comcast high speed > >>> internet at home via cable modem. Having some strange software [quoted text clipped - 45 lines] > HTH, > John > Just an update on this issue. I put a hub in-line between the PC > and cable modem. Then using a second PC I was able to use [quoted text clipped - 11 lines] > Thanks, > Z Thanks for closing the loop I'm glad you're working again -- John |
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