noip is a dynamic DNS client updater for no-ip.com services.
# pacman -S noip
To configure de No-IP DUC you have to execute the noip2 executable with -C option (create the configuration file step by step), or if you want to select all hosts in your account to be updated add the -Y option.
# noip2 -C
To see more options off the No-IP DUC use:
# noip2 -h
To start the service
# rc.d start noip
And to start at power always add it to the daemons section of /etc/rc.conf
# ... # DAEMONS = (syslog-ng network crond ... noip! ...)
# systemctl start nopi2
And to start automatically at boot simply do:
# systemctl enable noip2