Use the following command snippets to add DDNS to EdgeOS for NOIP.

set service dns dynamic interface eth0 service dyndns host-name mydynamichost.ddns.net
# note the client/group name and user, this is a group authentication configuration. 
set service dns dynamic interface eth0 service dyndns login <NOIP-group-name>%3A<noip-master-account-userid>
set service dns dynamic interface eth0 service dyndns password mysecurednspassword
set service dns dynamic interface eth0 service dyndns server dynupdate.no-ip.com