[AusNOG] Speaking of DNS...

[Mark Foster]

... what's the done method of troubleshooting DNS problems that only 
affect certain network(s), now that open resolvers are (hopefully) a 
thing of the past?

I have semi-regularly struggled with troubleshooting email delivery 
problems (for example), due to an inability to see what ISP X sees as my 
MX record.

Onceuponatime I could just query their DNS servers myself. Now it seems 
I either have to hope that their helpdesk understand what an MX record 
actually is, or try to find a shell account on a machine within their 
network to tinker with...

I didn't realise that DNS was something that was a candidate for a 
network of 'looking-glass' systems, but perhaps it is... Need a nice, 
rate-limited, hard-to-abuse web-based DNS lookup tool to become commonly 
available, perhaps?

Cheers
Mark.