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.
Quote from: Diggy on March 25, 2026, 07:50:23 PMWe'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
Quote from: hharry on March 26, 2026, 07:30:55 AMIt'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
Quote from: Diggy on March 26, 2026, 04:09:36 PMSince I don't have a github login
Then create one! LOL! :P
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.