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- DOCUMENT:Q103295 14-SEP-1993 [W_NT]
- TITLE :Using ARP in Windows NT Requires IP Activity or PING
- PRODUCT :Windows NT
- PROD/VER:3.10
- OPER/SYS:WINDOWS
- KEYWORDS:
-
- ----------------------------------------------------------------------
- The information in this article applies to:
-
- - Microsoft Windows NT operating system, version 3.1
- - Microsoft Windows NT Advanced Server, version 3.1
- ----------------------------------------------------------------------
-
- SUMMARY
- =======
-
- The Address Resolution Protocol (ARP) is a utility program that you
- can run at the Windows NT command prompt to add, delete, or view the
- entries in the ARP table for IP and physical addresses. However, you
- may need to run the PING utility or any IP activity before you can
- execute the ARP.
-
- MORE INFORMATION
- ================
-
- The ARP, included as a part of the TCP/IP in Windows NT, is used to
- obtain the physical address corresponding to an IP address. ARP
- defines a broadcast-based method for dynamically translating between
- IP addresses and physical addresses.
-
- Before you can send data between two network workstations, the
- physical addresses must be known. ARP gives you this capability: with
- ARP you do not need to know physical addresses and manually add them
- to a table.
-
- System administrators can use the ARP utility program to construct and
- maintain a table of physical addresses corresponding to IP addresses.
- The address table is kept in the ARP cache. The physical address
- information is stored temporarily (9 minutes). However, the physical
- address of the host is always known and not shown when the ARP table
- is viewed. When this address is added manually to the table, it is
- shown as permanent.
-
- To create and view the address table, do the following:
-
- 1. Ping a known IP address at the command prompt.
-
- 2. View the ARP table by running the following command:
-
- ARP -G
-
- NOTE: The ARP entries are only added to the ARP cache when an ARP is
- done for that address. When PING is run and the ARP entry did not
- exist in the ARP cache, an ARP packet will be generated and upon
- response from the machine claiming the IP address, the ARP entry will
- be added to the ARP cache. You can use use PING or any IP-based
- activity. These entries will be temporary entries. You can also
- manually add ARP entries to the ARP cache by using ARP -A. If you use
- ARP -A, an ARP request will not be generated when communicating with a
- particular machine.
-
- Additional reference words: 3.10
- KBCategory:
- KBSubCategary: tpip
-
- =============================================================================
-
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-
- Copyright Microsoft Corporation 1993.