[AusNOG] Telstra authoritative DNS issue

[Russell Langton]

Hi Philip,

I've sent you an email so we can sort out this Friday special ;)

On Fri, Feb 24, 2017 at 3:11 PM, Philip Loenneker <
Philip.Loenneker at tasmanet.com.au> wrote:

> Hi all,
>
>
>
> We have been having issues resolving DNS zones that are hosted by Telstra,
> which appears to be due to their authoritative name servers not responding
> to requests from multiple subnets we own. For example, www.afl.com.au can
> not resolve unless we use a DNS server outside our network, such as
> 8.8.8.8. Our DNS servers use root hints. Using other service provider
> connections appears to work ok.
>
>
>
> The two DNS servers that appear to be authoritative for the domain are:
>
> lon-mdn-dns-0.ngcdn.telstra.com
>
> chw-mdn-dns-0.ngcdn.telstra.com
>
>
>
> Attempting to perform a DNS lookup directly against either of them times
> out. Wireshark shows the request going out, but no response. We can ping
> both hosts, and in fact an nmap reveals that they are likely F5 load
> balancers.
>
>
>
> Is anyone else experiencing similar issues? Could someone from Telstra
> contact me off-list to help us identify the cause?
>
>
>
> Regards,
>
> *Philip Loenneker | Network Engineer** | TasmaNet*
>
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>
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