One strategy is to use DNS server software that handles changes for you. Set a time-to-die, and the software will publish a counting down TTL that is the numbe

One strategy is to use DNS server software that handles changes for you. Set a time-to-die, and the software will publish a counting down TTL that is the number of seconds left until the time-to-die. Set a start time, and the software won't publish the record until that time has been reached. Have two records with each, and one has a pre-programmed switch over from one thing to another. * http://jdebp.uk./Softwares/djbwares/guide/commands/tinydns-data.xml http://jdebp.uk./Softwares/djbwares/guide/commands/tinydns-d...