[AusNOG] Strange DNS issue

Heinz N ausnog at equisoft.com.au
Sun Oct 28 13:59:08 EST 2012

> Thanks Heinz. I lowered the refresh time yesterday and I've just seriously increased
> the serial. It has become a bit curiouser though. Telstra's lon-resolver.telstra.net
> appears to be returning the correct record when queried from a USA server:
> However, when I query the same server from my client's firewall which is connected to
> Bigpond ADSL, it fails:

I suspect your local telstra ADSL service is going through some sort of 
transparent DNS proxy which has not updated yet. I also saw similar update 
delays (some clients could see the update, some couldn't). I would hate to 
run telstra's DNS. Apart from being attacked all the time and the massive 
load from normal users, there would also be issues syncing up servers and 
caches spread all over the place. From their perspective, I would do 
everything I could to limit redundant updates. With telstra, I have found 
that the only thing you can do is sit on your hands and wait for it to all 
come good :-)

Heinz N

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