Manuel Lemos - 2009-09-27 04:55:18 -
In reply to message 2 from jww_van
If you lower the TTL of DNS records with good anticipation, DNS query caches will pick up DNS changes very quickly.
Anyway, point 7 mentions URL redirection to handle the case on which lowering the TTL is not possible or there may other computers caching DNS queries for longer than the previous TTL.