[AusNOG] Strange DNS issue

[Andrew Jones]

I don't have any secret knowledge of Telstra's DNS infrastructure, but 
it looks to me like that server is anycast, in which case some nodes 
might have updated, but not others.

A couple of traceroutes from here and the US (well, the last few hops):
11. bundle-ether15.ken39.sydney.telstra.net        0.0%    94   10.9   
9.6   5.8  14.4   1.6
12. bundle-ether6.ken-core4.sydney.telstra.net     0.0%    94   16.9  
13.1   6.2  19.5   3.5
13. lon-resolver.telstra.net                       0.0%    94    5.3   
7.0   5.0   9.1   0.9

10. tengige0-1-0-10.pad-gw1.sydney.telstra.net       0.0%    73  188.1 
188.3 182.7 194.3   3.4
11. bundle-ether3.chw-core2.sydney.telstra.net       0.0%    73  188.7 
192.2 186.7 198.3   3.5
12. lon-resolver.telstra.net                         0.0%    73  185.4 
185.4 185.2 185.5   0.1

-Jonesy

On 28.10.2012 13:59, Heinz N wrote:
>> 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 :-)
>
> Regards,
> Heinz N
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