Question about DNS assignment within a statically assigned IP

[starfer]

I understand what you are saying. I am just ranting a bit and noting that the terminology is confusing. It is just not super clear based on the naming being "DHCP static mappings". Based on the naming, I would have assumed that setting a specific MAC to an IP address (even within an active range) would make it so that the firewall will not hand out that IP via DHCP unless it is to the MAC address you have defined for that IP address. However, it seems that is not the case and that is good to know.

[Patrick M. Hausen]

I understand that it's a reasonably expected feature of some software in 2023 to handle edge cases like this in a graceful manner.

The problem is that the underlying implementation is of the old-fashioned "garbage in - garbage out" kind. It's your responsibility as an operator to ensure a consistent configuration.

OPNsense - and I am by no means belittling the effort of Franco, Ad and colleagues - is technically "just" a UI on top of a big bag of completely unrelated open source projects. So to enforce what seems to be a problem in the UI without the bottom layer even recognising there is a problem would of course be nice, but think of the effort that would take and how many more urgent if not problems then calls for features they have on their desk.

So if at all this could be a call for better documentation. I just checked the docs and it seems static assignments are not mentioned at all, at least not in the main DHCPv4 section.

Then again they (the developers) are in the midst of replacing ISC-DHCP with ISC-Kea. So I would not even expect that. Writing documentation that is obsolete in about half a year is even less fun than writing documentation. 

Kind regards,
Patrick

[starfer]

Gotcha, appreciate the help and info.