WinXP Pro SP2 - No internet connectivity

January 16, 2011 at 17:09:07
Specs: Windows XP Pro SP2, AMD Phenom
I have an older PC using cable internet to connect. It works fine. There is no router, no other PCs, no network.

I built a new PC. I installed WinXP Pro SP2 from a USB drive. I also installed the latest version of the mobo drivers including those for the Realtek NIC. When I swap the cat5 cable from that goes between the cable modem and my old PC to the new PC, the new PC does not connect to the internet. After a reboot the IP address is a 169.254.x.y address. Here's what I have tried so far to fix the problem:

- ipconfig /release, /flushdns, /renew ... and so forth
- An .exe file designed to fix Winsock
- An SP2 patch and registry mod ("AssumeUDPEncapsulationContextOnSendRule"=dword:00000002)
- Device management, changing the speed to 10 Mbps, Full Duplex
- Disabling APIPA by adding a registry DWORD
- Disabling Windows Firewall

None of these work. After this I took my ip address, subnet mask, etc. from my old pc and under tcp-ip properties manually gave it an IP address. The LAN icon now shows 100 Mbps (or 10 if the above change is in effect) Connected but does not actually connect to the internet. The cable is fine because it allows my old PC to connect. Are we looking at a hardware problem at this point?

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January 16, 2011 at 17:10:52
Forgot to mention, ping works.

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January 17, 2011 at 12:15:45
Problem is FIXED. The answer is:

Needed to go to [ Device Management > NIC properties > Advanced ] and change the Network Address to the physical (or MAC) address shown on my old PC. If you ISP only gives ya one. Hopefully this will save someone else ~8 hours.

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