People should watch their name servers and their zones on their primary and secondaries. At least the 'host' command can be used with the '-C' option to do this at regular intervals.

[] host -C -A -L 1 zonename is what you really want to do. This covers most common problems. If that comes out clean, you are probably safe ... -- Eric Wassenaar P.S. For those of you who want to stay up to date: [] host -V Version 951024