Floating IP the same on HA pair?

A floating self-IP follows the traffic-group that contains it. A traffic-group can only be active on a single member of a device-group at any given time.

Normal configuration would be that the floating is the same on all units in the same device-group. The fact that you're able to configure them differently means that the two devices are not in sync with each other.

In addition to any non-floating IP addresses, the active device will respond to requests for any floating IP, and any virtual address (the destination field in a virtual sever) in a traffic-group that it is active for.

When a failover event occurs, the newly active device sends out gratuitous arps for the IP addresses that it now owns. It is possible that those garps are being quietly ignored by your network - if this is the case, then clearing the ARP entry on the router (or client, if you're on the same subnet) would resolve that.

BigIP also offers the ability to use a single MAC address for the traffic-group, to work around this sort of problem. You can configure that feature under Device Management / Traffic Groups / . Using MAC masquerade means that not only does the IP address float to the active device, but it takes the MAC address with it.