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Cannot ping certain IP address

One remote computer cannot ping the server using its original IP address. The machine that is in this location now is using this IP address, but when we install the new machine with that IP address it cannot ping the server, but can ping other workstations and remote machines. We go through two Adtran switches. I really am stumped by this problem and have not experienced this with any other machines when they were replaced. They are running XP SP2.
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dawned
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dawned
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tismetooCommented:
Dawned

Can you provide more detail about the IP addresses in question - I can't get my head around what is connecting to what and from where.
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dawnedAuthor Commented:
A station control unit (SCU) is connecting to  an Adtran switch in the field. The switch is connected to the Fujitsu equipment (OC-48) which connects to another Adtran switch and then to the server. Basically it is connecting directly to the server without any routing taking place in the field.  The IP addresses are: server x.x.x.1, SCU x.x.x.10, workstations x.x.x.2, x.x.x.4, and x.x.x.5. The SCU can ping all of the workstations and all other SCU's which range from x.x.x.1 to x.x.x.9. We do have a static arp set between the server and the original SCU, but no one else here thinks that could be a problem because the MAC address being statically linked to the IP address should not in their opinion prevent a ping from working.. I am going to try changing the MAC in the arp table anyway to see if that fixes my problem.
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tismetooCommented:
Is the Fujitsu equipment a router? Because if not the workstation has no way of accessing the server.

They are also wrong about the MAC address not affecting a ping, unless I misunderstand where the ARP table referred to is in relation to the workstation. If the wrong MAC address points to the desired IP address the packets will not arrive at your new box.
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dawnedAuthor Commented:
The Fujitsu is our SONET equipment. We own our own fiber optic cable so by connecting to a switch and then to the SONET it is basically just like having a very long Ethernet cable connecting the SCU to the server. Since the SONET  uses Ethernet, the 10 SCU's that also use Ethernet connect without a router since they are on the same subnet.  Other sections of our system are on a different subnet therefore they connect to a router which then routes the traffic to the server. I was able to resolve the problem by changing the arp table to match the MAC of the new SCU. The guys I work with didn't think the MAC address being statically set to an IP address would prevent a ping from working, but apparently it does. My problem is now solved. Thanks for your comments.
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