ARP Cache Commands May Not Work Correctly

Example

To see what's currently in the ARP cache:

   c:>arp -a
   No ARP Entries Found

Attempt to add an entry:

   c:>arp -s 22.101.9.229 08-00-09-12-34-56 22.101.102.207
   The ARP entry addition failed: 3

Check the cache again:

   c:>arp -a
   No ARP Entries Found
   c:>ipconfig

   Windows NT IP Configuration
   Ethernet adapter EE161:

        IP Address. . . . . . . . . : 22.101.102.207
        Subnet Mask . . . . . . . . : 255.255.0.0
        Default Gateway . . . . . . : 22.101.0.1

   Ethernet adapter NdisWan5:

        IP Address. . . . . . . . . : 0.0.0.0
        Subnet Mask . . . . . . . . : 0.0.0.0
        Default Gateway . . . . . . :

   Ethernet adapter NdisWan9:

Attempt to alter an entry:

   c:>arp -s 22.101.9.229 08-00-09-12-34-56

   c:>arp -a

   Interface: 22.101.102.207

      Internet Address      Physical Address      Type
      22.101.101.15         00-20-af-1d-2b-91     dynamic

Ping the address and let ARP fill in the cache:

   c:>ping 22.101.101.15

   Pinging 22.101.101.15 with 32 bytes of data:


   Reply from 22.101.101.15: bytes=32 time<10ms TTL=32
   Reply from 22.101.101.15: bytes=32 time<10ms TTL=32
   ^C
   c:>arp -a

   Interface: 22.101.102.207

      Internet Address      Physical Address      Type
      22.101.0.1            08-00-02-04-89-82     dynamic
      22.101.101.15         00-20-af-1d-2b-91     dynamic

Attempt to delete the entry:

   c:>arp -d 22.101.101.15


   c:>arp -a

   Interface: 22.101.102.207

      Internet Address      Physical Address      Type
      22.101.0.1            08-00-02-04-89-82     dynamic
      22.101.101.15         00-20-af-1d-2b-91     dynamic