DHCPv6 and DDNS

[Simon Hobson]

Nicolas C. <dhcp at nryc.fr> wrote:

> When the DHCP server is doing the DDNS update, it has to authenticate one way or the other the client. If not, what would happened if two clients were using the same hostname ?

> This is called "conflict-detection" : the client provides a hostname and an identifier (historically client-identifier with DHCPv4, DUID with DHCPv6), the DHCP server provides an IP address to the client and it does the DDNS work only after validating that there are no conflicts (duplicates) with the hostname.

With IPv4, it'll update the records because it'll pass the "does it have the safety TXT record" test. It's why the check is there - to stop someone naming their client he same as your important server and hi-jacking the DNS records.