Router hates one machine?

I do gratis troubleshooting from my local health department. They have one machine (a Dell Optiplex 745) running XP Pro sp3 that was working fine. It is connected to a DLink DGS-2208 Switch. Until last Friday, it connected at 1 G. Thursday evening, they installed the current Adobe Reader update and when the machine booted Friday morning, it had no connectivity.

The machine connected fine via a USB to LAN adapter, and I brought the machine home and it connected to my network without problem with the integrated LAN jack. I scanned it with MBAM, SAS, Root Kitty and GMER, Housecall online and Symantec's Endpoint Security, which was up to date. It scanned clean in every case.

I took it back, hooked it up and it wouldn't connect. I tested the connection from the switch to the end of the LAN cord. It tested fine with a tester, and a laptop connected there worked fine. I tried the desktop at another station and it refused to connect there as well.

I installed a new LAN card in the machine, and it connected flawlessly. I assume, therefore that there is a conflict between the onboard LAN adapter and the network. How/where should I look next?

Thanks, CJon

 

Have you checked the setup in the Router or DHCP server to make sure the MAC address hasn't been added to the block list?

 

Go into device manager and remove the NIC and scan for new hardware, see if it works after that.
Had the same issue after removing Norton from my brothers computer.
Then troubleshoot:
If DHCP, is that machine getting an IP address on the network? (not the 169.x.x.x address)
Can you ping the loopback? 127.0.0.1

 

Tried that. No joy. Still get the 169.x.x.x address.

RE the suggestion about checking for the addition of the machine to the blocklist, That is my next step, but the router is property of the local ISP and I don't have access.

 

My thought exactly. Unfortunately, the router is built in to the ISP's modem and I don't have access. Methinks I'm gonna have to call my buddy at the phone company. (The ISP)

 

How is this network set up? What is doing the DHCP for the network?
What is up stream from that switch? A DSL modem? a cable modem? a router?

What is the IP scheme of the rest of the network? 10.10.x.x, 192.168.1.X, what is the subnet?
Have you added any new devices to the network before this started?

 

Sorry, I'm not much of a network guy. I didn't set this one up, but it is 10.10.x.x. Subnet seemed odd to me, I don't have access now, but it was something like 255.255.190.0

Upstream from the switch is a DSL modem and a router (I think). I think the DHCP is provided by the router. However, it could have been another switch with the DHCP provided by the ISP's modem. Most of their modems have 4 port routers built in. But, I have the same ISP (and have a router connected, but with DHCP disabled, so it acts as a wireless AP) and it has a 192.168.x.x scheme. None of the system at the health dept is wireless.

With the little I know, could they have pulled a feed off of the modem into a router, and then had the router provide the DHCP function and set the IP scheme as 10.10.x.x?

 

Can you give that machine a static IP in the same range as the others but outside of what the router is issuing?

Set it to static 10.10.X 233 (or some other high and obscure number), static subnet and gateway. You might have to use the gateway as the dns server. If with that configuration you can't ping google.com but you can ping 4.2.2.2, you can change the DNS server to 4.2.2.2 for testing. Look up the DNS servers for the isp and switch them after testing

 

How many PCs are on the network?
You can run netscanner http://majorgeeks.com/SoftPerfect_Network_Scanner_d5954.html

The ISP's router may not have that many clients in the DHCP scope.
My DSL had 4 IPs.

 

OK, I was out there today. Here's their setup.
Comtrend CT5363 ADSL modem provided by ISP.
One only LAN cable from modem to Cisco ASA 5505 Adaptive Security Appliance
3 LAN cables from 5505, one to Netgear DS116 Other 2 unknown destination (maybe DLink).
One cable from DS116 (or 5505) to DLink DGS 2208 switch. (upstairs)
Cable from Dlink to "sick" machine.

Machine worked fine before it broke, and now it works fine on new Dlink DL-503+ PCI card.
IPCONFIG info as follows:
DNS Suffix: dhss.mo.gov
IP: 10.37.105.158
Subnet: 255.255.255.192
Gateway: 10.37.105.129

I'm still thinking that the MAC address of the onboard LAN adapter got dumped into a block list someplace. Neither the DLink nor the Netgear are managed, so it would have to be in the Cisco or the Comtrend.