Troubleshooting
Problem
This document provides information about removing ARP Cache entries from the ARP Table.
Resolving The Problem
At times, network devices can be replaced with new hardware or a new Network Interface Card (NIC) and retain the original TCP/IP address. When the new hardware device or NIC is powered on, connectivity might not occur because of an old ARP cache entry in the IBM® iSeries™ family of servers ARP table. Until the ARP cache entry with the old MAC address and TCP/IP address is removed, communications over TCP/IP will fail.
The easiest way to clear this entry is to use iSeries Navigator. The following steps outline the procedure for clearing an ARP Cache Entry:
| 1 | Open iSeries Navigator. |
| 2 | Expand Network. |
| 3 | Expand TCP/IP Configuration. |
| 4 | Expand IPv4. |
| 5 | Click on Interfaces. |
| 6 | Right-click on the iSeries family's TCP/IP Interface and select ARP. Note: The ARP option will work only for an ACTIVE interface. A new window, similar to the one below, will appear: |
| 7 | Left-click on the TCP/IP address in question to highlight it, and click on Delete Entry: |
| 8 | Click Apply. |
After the ARP Cache Entry is removed, try the connection again. If the connection continues to fail, a communications trace is recommended for troubleshooting.
Note: The duration that an entry resides in the ARP cache is defined by the ARP Cache Timeout (ARPTIMO) value in the CHGTCPA command.
Historical Number
367734615
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Document Information
Modified date:
18 December 2019
UID
nas8N1015699