DNS notify

We've had entirely too much fun at work recently, trying to get dns-notify to work. It only worked on one server, where the firewall had silently crashed, so we followed that red herring for a little while.

And then, suddenly, the well, duh obvious breakthrough.

options {

//other stuff removed

// Send zone change notify

notify yes;

also-notify { server1; server0; server3; server6; server4; server5; server7; };

}; // End of options section

After our thrashing, each zone declaration (around a thousand of them!) had notify yes turned on, but it still didn't help.

zone zone-name {

        stuff;

        notify yes;

};

Even though I would have expected notify yes to work when I didn't use explicit, it didn't; but listing them in also-notify as though explicit were on did work.

Finally!