Hi Bent,
24 hours before I plan to do the migration I set the
ttl to 3600 (1h).
Then 1 hour before the migration I change it again, this time to 600 (10m).
And finally 10 minutes before the migration I change it to 0.
Thanks for the tips! In this case it seems we are going to switch the IP
from server to server rather than change DNS.
Cheers!
Daniel