For detailed information about this script, refer to the corresponding blog post.
/tool fetch https://raw.githubusercontent.com/FwMotion/6rd-on-routeros/master/6rd-on-routeros.rsc output=file dst-path=6rd-on-routeros.rsc
/import file=6rd-on-routeros.rsc
/file remove 6rd-on-routeros.rsc
/system script run script-6rd-centurylink
/system scheduler add name=scheduler-6rd-centurylink interval=5m on-event=script-6rd-centurylink