I have a number of users who are connecting to MySQL over a VPN, so we have grants along the lines of "grant select on foo.* to user@ipaddress1" and so on.
This week, the IP used on the VPN changed to address2, so user@ipaddress1 grants no longer work.
What's the best way to handle updating the user and grant information in MySQL to reflect this change?
Note that the grants are a serious mess, because some users are excluded from particular columns in particular tables, so we've had to do grants around the excluded objects.