Stefan Jensen wrote: One of those issues that has delayed IPv6 in my opinion. It appears that ISC has put this functionality in a few years after your post. Below is what I have been using in my dhcpd6.conf for over a year now. It seems to be working find for now. Some of the variable names are different between versions, but this should help anyone figure it out if they need other items in their conf. option domain-name "example.org"; option dhcp6.name-servers 2001:db8::1; option dhcp6.sntp-servers 2001:db8::1; default-lease-time 86400; max-lease-time 87000; authoritative; log-facility local7; #ddns-update-style ad-hoc; ddns-update-style interim; ddns-ttl 600; #ignore client-updates; deny client-updates;