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True, that's what i plan to do.

I haven't marked the checkbox per interface.
Maybe that's the reason i haven't stumbled across the according note :-(

Instead i marked the checkbox per mapping.
Assume same clue is applicable here ..

Thanks a lot fort your fast feedback!

Sorry, worth to mention it's OPNSense 26.1.9 amd64

Some time ago i changed from ISC to KEA DHCP, including static mappings (Name/IP but also static ARP).
I kept the ISC configuration as is, but disabled ISC DHCP.

Recently i had to update one device to a newer one, keeping the name and the IP address in KEA DHCP, but changing the MAC address.
This worked out, until to the point i updated OPNSense with a reboot afterwards.

The new device failed, due to the fact that the former MAC address was taken.
Removing the static mapping in ISC DHCP and to be sure, flushing ARP cache, solved the issue.

Hence my question: Is the static mapping in ISC DHCP active although ISC DHCP is not enabled?

Sorry, here i'm lost ..
Are you saying IPv6 is just an addon rather than a replacement of IPv4?!

In general i agree .. however my setup is a private home setup rather than a DC, or some other commercial network.

One rational, i'd like to have my own namespace for devices.
Especially not the name, some consumer devices come up with (sometimes not even modifiable).
I saw some other posts in this forum about mapping of just the DNS name.
However, issue is the same as mine!

Positive side effect on IP address assignment: Having "similar" suffixes for IPv4 and IPv6 addresses eases debugging.

Then, i was wondering about further use cases ..
I.e. for some reason i assume ISC implemented DUID as well as hw-address mapping.

Due to end of live and as suggested, i changed my setup from ISC to KEA DHCP.
DHCP4 works pretty well, but for DHCP6 i'm barely missing hw-address type support.
Rational:
- For some devices, I'd like to have static mappings.
- Especially some of these devices provide a DUID type, not usuable for a static mapping.

KEA DHCP6 supports hw-address type mapping.
As of now I marked the checkbox "Manual config" in KEA DHCP6, and added the mapping to the config file.
This works pretty well and as expected.

My question: Are there any plans to support hw-address type mapping from within the GUI?