Anyone with 123-Reg hosted domains will probably be aware that their DNS died over the weekend. This ought not be possible, given the redundancy, but for about 24hrs nobody with domains hosted with 123-Reg (well nobody who uses their DNS anyway) will have had web/email. That includes me and several of my clients :-(
Therefore I want to set up a DNS server on my own hosted server to act as (probably) a tertiary server (maybe secondary, not sure it matters for the sake of this question).
In an ideal world I'd have a server which was fully (automatically) synced with 123-Reg's servers for all the domains I'm interested in. Given that I don't have any control over 123-Reg's servers I'm not sure how close I can get to that. I've also never set up DNS from scratch before (I've used various hosted DNS options which don't require me to think), but I think this would be a good time to learn more about DNS configuration. Not least because as a tertiary server it won't normally matter if I get it wrong :-)
First question is pretty basic therefore: where do I start?