Occasionally, a PC will not allow a packet to be sent in its own subnet unless the IP and MAC address is setup in its ARP table. The ARP table can be seen in a DOS window. The following commands apply.

ARP –a view the table
ARP –s [IP Address] [Mac Address] to add a static entry

For example:

ARP –s 192.168.0.1 00-22-A8-B1-99-55