Duplicate IP addresses
The OSA-Express adapter in QDIO mode recognizes duplicate IP addresses on the same OSA-Express adapter or in the network using ARP and prevents duplicates.
About this task
Several setups require duplicate addresses:
- To perform IP takeover you need to be able to set the IP address to be taken over. This address exists prior to the takeover.
- For proxy ARP you need to register an IP address for ARP that belongs to another Linux instance.
- For VIPA you need to assign the same virtual IP address to multiple devices.
You can use the qethconf command to maintain a list of IP addresses that your device can take over, a list of IP addresses for which your device can handle ARP, and a list of IP addresses that can be used as virtual IP addresses, regardless of any duplicates on the same OSA-Express adapter or in the LAN.