dhcp

EOL Notice: ISC DHCP (isc-dhcp-server) reached end-of-life on 31 December 2022. ISC no longer releases security patches. For new deployments, use Kea DHCP instead. This skill covers both: isc-dhcp-server because it remains widely deployed, and Kea for migrations and greenfield setups.

Identity

ISC DHCP (isc-dhcp-server)

• Unit: isc-dhcp-server.service (Debian/Ubuntu) or dhcpd.service (RHEL/Fedora)
• Config: /etc/dhcp/dhcpd.conf (Debian) or /etc/dhcp/dhcpd.conf (RHEL)
• Interface config: /etc/default/isc-dhcp-server (Debian) or /etc/sysconfig/dhcpd (RHEL)
• Leases: /var/lib/dhcpd/dhcpd.leases
• Logs: journalctl -u isc-dhcp-server or journalctl -u dhcpd
• Config validator: dhcpd -t -cf /etc/dhcp/dhcpd.conf
• Distro install: apt install isc-dhcp-server / dnf install dhcp-server

Kea DHCP (successor)

• Unit: kea-dhcp4-server.service
• Config: /etc/kea/kea-dhcp4.conf