When you install isc-dhcp-server, you need to copy the config files as isc-dhcp-server6 in each area.
/etc/default/isc-dhcp-server6
DHCPD_CONF=/etc/dhcp/dhcpd6.conf
# DHCPDv4_CONF=/etc/dhcp/dhcpd.conf
# DHCPDv6_CONF=/etc/dhcp/dhcpd6.conf
# Path to dhcpd’s PID file (default: /var/run/dhcpd.pid).
DHCPD_PID=/var/run/dhcpd6.pid
# DHCPDv4_PID=/var/run/dhcpd.pid
#DHCPDv6_PID=/var/run/dhcpd6.pid
# Additional options to start dhcpd with.
# Don’t use options -cf or -pf here; use DHCPD_CONF/ DHCPD_PID instead
OPTIONS=”-6″
I added a DHCP server to my primary DNS server. I enabled IPv4 and IPv6.
Setting up host addresses for IPv6 is tricky.
host ubuntu Server_Name {
host-identifier option dhcp6.client-id Long_ID_String;
fixed-address6 IPv6 address;
}
How to get
host-identifier option dhcp6.client-id?
I opened the DHCPv6 server.
sudo systemctl -l isc-dhcp-server6
Go the the server that you want to find the information on
sudo netplan try, enter, sudo netplan apply
Load sudo systemctl -l isc-dhcp-server6 again. You will see it on the screen. Copy the string into /etc/dhcp/dhcp6.conf for that server.
Sudo systemctl restart isc-dhcp-server6 or sudo reboot. do try and apply again and ifconfig to check