Replace OpenWrt DHCP and DNS Servers with Kea DHCP4 and BIND9

This guide explains how to replace the default OpenWrt DHCP and DNS servers with Kea DHCP4 and BIND9.

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1. Install BIND and Kea DHCP4

opkg update
opkg install bind-server bind-check bind-dnssec bind-tools kea-dhcp4

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2. Remove OpenWrt's default dnsmasq and odhcpd-ipv6only

opkg remove dnsmasq odhcpd-ipv6only
uci -q delete dhcp.@dnsmasq[0]
uci commit dhcp

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3. Install and Configure Kea DHCP4

Copy init script and configuration file:

cp ./kea-dhcp4/etc/init/kea-dhcp4 /etc/init/
cp ./kea-dhcp4/etc/kea/kea-dhcp4.conf /etc/kea/

Edit the DHCP server configuration:

vim /etc/kea/kea-dhcp4.conf

Start and enable Kea DHCP4 service:

/etc/init.d/kea-dhcp4 start
/etc/init.d/kea-dhcp4 enable

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4. Configure BIND9 DNS Server

Edit the main configuration:

cp ./bind/etc/bind/named.conf /etc/bind/
vim /etc/bind/named.conf

(Optional) Edit zone files:

vim /etc/bind/db.liuyu.dns
vim /etc/bind/db.192.168.1

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5. Configure OpenWrt to use local BIND DNS Server

Set WAN DNS to localhost:

uci set network.wan.dns='127.0.0.1'
uci commit network

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6. Start and enable BIND service

/etc/init.d/named start
/etc/init.d/named enable

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7. Other useful commands

Restart services if needed:

service kea-dhcp4 restart
service named restart

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This setup replaces the default dnsmasq with a more flexible and robust Kea DHCP4 and BIND9 combination.

GitHub Repository: https://github.com/liuyuf78fk/isc-openwrt