Arp Table Entries are invalid

The server is running Windows 2003 R2 Enterprise. Here is the problem.
I have several servers, more than 20, and only one of these is
exibiting this problem. When I ping a from Host A to Host B, C or D
continuously, I get a Request Timed Out for anywhere from 5 to 15
minutes.

During that time the ARP table shows the IP I am pinging with a
00-00-00-00-00-00 MAC and Type is listed as INVALID.

When I ping any other server other than HOST B, C or D, it returns a
reply immediately and the ARP Table is updated immediately with the
correct MAC address for that server and the type is listed as Dynamic.

Once the ARP Table is updated with the correct MAC periodically, it
drops the correct MAC and sets the MAC to 00-00-00-00-00-00 and the
Type is listed as INVALID again. The pinging will abruptly start Timing
Out again for another 20 minutes or so.

The big problem is that the server having the ARP issues is my backup
server and he can't get to these remote servers to back them up.

All servers are on the same switch.

I have tested the network cable and they are all good. I have switched
to the other onboard NIC on the server and I am experiencing the same
problem regardly of which NIC I use.

Any ideas?

Jef

.

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