Devices that support ARP offload

Certain devices provide an ARP offload function that offloads all ARP processing to the adapter. The function provided by the adapter impacts the ability of TCP/IP to display ARP cache information or ARP counter statistics for these devices.

Note: ARP processing is relevant only for IPv4 LAN interfaces.

The following devices provide an ARP offload function and provide ARP cache data or ARP counters to TCP/IP.

MPCIPA (OSA-Express Gigabit Ethernet) with a minimum required microcode level of [MCL] 401
All other OSA-Express features in QDIO mode

Note: If multiple TCP/IP instances are sharing the device, the ARP data will represent all TCP/IP instances using the device. This information is provided to TCP/IP every 30 seconds from the device.

The following devices provide an ARP offload function and do not provide any ARP cache data or ARP counters to TCP/IP:

MPCOSA (OSA-2 Fast Ethernet, FDDI)
MPCIPA (OSA-Express Gigabit Ethernet) with a microcode level earlier than [MCL] 401

Note: For IPv6 LAN interfaces, TCP/IP performs all the neighbor discovery processing, maintains the neighbor cache, and provides the ability to display neighbor cache information.