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When ARP broadcasts out on the network to resolve an address and then adds that entry to the ARP cache, it creates a dynamic entry A dynamic entry is added and removed from the cache automatically The systems administrator can add static entries to the ARP cache manually when necessary This can be especially helpful when you have a computer that transfers large amounts of data to a remote host continually By adding a static entry for the remote host into the computer s ARP cache table, you determine that ARP broadcasts do not need to occur periodically, which minimizes network traffic This option can also be used to test whether the local computer is receiving updates correctly Suppose that you are trying to connect to another computer on the same network You are unable to find the remote computer; however, the other machines around you seem to work fine First, display the local ARP cache to determine whether the target host has an entry present in the ARP cache If not, you can add a static entry into the ARP -a and ARP -g both ARP cache to allow you to determine whether display the contents of the ARP cache the computer is properly receiving updates If, with the new static entry placed in the cache, you notice that you can now connect to the remote computer, the problem was probably that the cache was not being updated correctly with the appropriate MAC address Adding a static entry bypassed that problem, because you have forced the entry into the cache, which is checked first for ARP resolution You can manually add entries with the following command:
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ARP -s <IP address> <MAC address>
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You might need to delete entries that you have manually added or manually remove any entries that have been dynamically added to the ARP cache Use the following command to delete an entry from the ARP cache:
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ARP -d <IP Address>
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Unlike static addresses, which never age out, dynamic addresses remain for only a predetermined amount of time The initial cache lifetime of entries is two minutes
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on Windows systems, but Windows adjusts the size of the ARP cache automatically If entries are reused within two minutes, they remain for ten minutes A Registry parameter within Windows is also available to allow for more control over the aging parameters The Registry parameter is located in the following location:
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Hkey_Local_Machine\System\CurrentControlSet\Services\Tcpip\Parameters\ArpCacheLife
If the ArpCacheLife entry is not found in the Tcpip\Parameters portion of the Registry, the default lifetime of two minutes (120 seconds) will be used If you want to create the ArpCacheLife Registry entry, create a dword value named ArpCacheLife and set its value to a value in seconds
RARP
A little-known protocol exists to facilitate the reverse function of ARP The Reverse Address Resolution Protocol (RARP) enables a machine to learn its own IP address by broadcasting to resolve its own MAC address A RARP server containing these mappings can respond with the IP address for the requesting host In most cases, a machine knows its own IP address; therefore, RARP is primarily used in situations such as diskless workstations or machines without hard disks Dumb terminals and NetPCs are good examples of diskless workstations To summarize, although ARP is a simple protocol compared to most other protocols, it is just as important as any other to TCP/IP for proper functionality The utility included with this protocol (ARP) will enable you to display and modify the ARP cache as needed This enables you to effectively troubleshoot any issues that might arise with ARP Table 6-1 details the ARP switches and their corresponding definitions
TABLE 6-1
ARP Switch
-a -g -N -d -s
Definition
Displays the entire current ARP cache or a single entry by allowing you to specify the IP address of an adapter Same as -a Shows the ARP entries for a specified IP address and allows for modification Deletes a specified entry or when used by itself it will clear the entire ARP cache Adds an entry to the ARP cache by specifying a MAC address and an IP address
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