[wellylug] Website - Possible Downtime

[Mark Foster]

> Second, I ran a primary name server for boutel.co.nz, with the secondary at 
> paradise. When I changed it to reflect the new ip address, the automatic 
> update of the secondary failed, presumably because it would only accept a 
> notification from the ip address it believed was its master, and I was 
> sending from a new address that it didn't recognise. TC refused to make the 
> change for me, saying it was my responsibility, and they couldn't touch that 
> record. The way I got round it was to get them to take over the primary dns 
> as well, and then to fix both - and not forgetting to update the .nz record 
> for the change of name servers for the domain.
>

As long as the .nz registry was updated with the correct IPs for both pri 
and sec DNS, this should be done automagically.
I've gone through the IP-address-change bit a couple of times with regard 
to the domains I host (My colo has been through 3 IPs now) and have never 
had any problems.

A NOTIFY is sent to the Secondary nameserver from the Primary if the 
Serial of the DNS record has been updated.
The Secondary compares serial numbers and if the one it has in memory is 
out of date, it actions an AXFR and grabs the new record. It can always go 
back into the DNS root to confirm the authenticity of whether 
xyz-new-ip-address should be authoritive or not.

Mark.