In this article I will show you how to install and configure Kea DHCPv4 server on Ubuntu 23.10. Kea DHCP server is the successor of ISC DHCP server which recently got obsolete and is no longer maintained by ISC consortium.
Install kea dhcpv4 server
sudo apt update
sudo apt install kea-dhcp4-server
rename /etc/kea/kea-dhcp4.conf to kea-dhcp4.conf.bak
sudo mv /etc/kea/kea-dhcp4.conf /etc/kea/kea-dhcp4.conf.bak
Create a new, empty configfile by using your favorite texteditor
sudo nano /etc/kea/kea-dhcp4.conf
Copy/paste the content below and adjust the italic options as required
{
“Dhcp4”: {
“interfaces-config”: {
“interfaces”: [ “ethx” ],
“dhcp-socket-type”: “raw”
},
“control-socket”: {
“socket-type”: “unix”,
“socket-name”: “/run/kea/kea4-ctrl-socket”
},
“authoritative”: true,
“lease-database”: {
“type”: “memfile”,
“persist”: true,
“name”: “/var/lib/kea/kea-leases4.csv”,
“lfc-interval”: 3600
},
“renew-timer”: 15840,
“rebind-timer”: 27720,
“valid-lifetime”: 31680,
“reservation-mode”: “out-of-pool”,
“dhcp-ddns”: {
“enable-updates”: true
},
“ddns-qualifying-suffix”: “smoky020.nl“,
“ddns-override-client-update”: true,
“ddns-override-no-update”: true,
“ddns-replace-client-name”: “always”,
“ddns-update-on-renew”: true,
“option-data”: [
{
“name”: “domain-name-servers”,
“data”: “ip address“
},
{
“name”: “domain-search”,
“data”: “smoky020.nl“
},
{
“name”: “domain-name”,
“data”: “smoky020.nl“
}
],
“loggers”: [ {
“name”: “kea-dhcp4”,
“output_options”: [ {
“output”: “stdout”
}
],
“severity”: “DEBUG”,
“debuglevel”: 0
}
],
“subnet4”: [
{
“id”: 1,
“subnet”: “subnet/24“,
“option-data”: [
{
“name”: “routers”,
“data”: “ip address“
}
],
“pools”: [
{
“pool”: “ip start – ip end“
}
],
“reservations”: [
{
“hw-address”: “mac address“,
“ip-address”: “ip address“,
“hostname”: “hostname“
},
{
“hw-address”: “mac address“,
“ip-address”: “ip address“,
“hostname”: “hostname“
}
]
}
]
}
}
Save the .conf and restart kea dhcp4 server
sudo systemctl restart kea-dhcp4-server
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