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Docs / IPAM

DHCP options

Option code plus JSON payload on the subnet, or on a client class. Optional vendor.

On /subnets/{id}, DHCP options:

  1. Code (e.g. 6 for DNS servers).
  2. Payload JSON.
  3. Optional vendor class.

Payload shapes dhcpd understands:

{"addresses":["8.8.8.8","1.1.1.1"]}
{"ip":"10.20.20.1"}
{"string":"office.example.com"}
{"uint32":86400}
{"hex":"0102"}

Code 6 with addresses becomes option 6 (DNS). Code 42 with addresses is NTP — the subnet NTP servers field also sets option 42; a stored option wins if both exist. NTP.

Mask, router, and lease-time are built-in from the subnet row. Set Gateway on the subnet so IPAM and DHCP agree.

Priority (later wins): global < subnet < pool < class < reservation.

Class-scoped options: Client classes. Wrong JSON fails the save. There is no dhcpd.conf snippet to edit on each node.