Override DHCP Valid Lifetime

[Diggy]

We're using Kea DHCP server.  The Valid Lifetime set on the Settings tab is sufficient for most of our subnets.  However, there are a couple subnets that require a shorter lease time.

Which Option code, if any, overrides the value set on the Settings tab?  There isn't a code that says "valid lifetime".  The closest I found is "renewal time [58]", but because this is a production router, I cannot do trial and error.  Is "renewal time [58]" the correct code to overrride default valid lifetime?

UPDATE:
The code I mentioned above is for IPv4.  I also need the correct code for IPv6.  Please and thanks.

[hharry]

We're using Kea DHCP server.  The Valid Lifetime set on the Settings tab is sufficient for most of our subnets.  However, there are a couple subnets that require a shorter lease time.

Which Option code, if any, overrides the value set on the Settings tab?  There isn't a code that says "valid lifetime".  The closest I found is "renewal time [58]", but because this is a production router, I cannot do trial and error.  Is "renewal time [58]" the correct code to overrride default valid lifetime?

UPDATE:
The code I mentioned above is for IPv4.  I also need the correct code for IPv6.  Please and thanks.

kea claims to support per subnet valid-lifetime config option https://kea.readthedocs.io/en/kea-3.0.2/arm/dhcp4-srv.html#shared-networks-in-dhcpv4, however isn't exposed in OPNsense UI, perhaps consider raising a new feature request ?

It's been requested before here -> https://github.com/opnsense/core/issues/7592

[Diggy]

It's been requested before here -> https://github.com/opnsense/core/issues/7592

Unfortunately that issue is "Closed as not planned".  Since I don't have a github login, I am officially making my request here for that feature.  LOL

[nero355]

Since I don't have a github login

Then create one! LOL! :P

[sopex8260]

Make all of them short.
Or use affinity, a very useful subset of instructions.
Or use the manual configuration to do exactly what you want.