Confirming that an IP address has been set under layer 3
There may be circumstances that prevent an IP address from being set, most commonly if another system in the network has set that IP address already.
About this task
The Linux® network stack design does not allow feedback about IP address changes. If ip or an equivalent command fails to set an IP address on an OSA-Express network CHPID, a query with ip shows the address as being set on the interface although the address is not actually set on the CHPID.
There are usually failure messages about not being able to set the IP address or duplicate IP addresses in the kernel messages. You can find these messages in the output of the dmesg command. In Red Hat® Enterprise Linux 9.2, you can also find the messages if you issue journalctl.
If you are not sure whether an IP address was set properly or experience a networking problem, check the messages or logs to see if an error was encountered when setting the address. This also applies in the context of HiperSockets and to both IPv4 and IPv6 addresses. It also applies to whether an IP address has been set for IP takeover, for VIPA, or for proxy ARP.