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.