[Pdns-users] Problems resolving specific domain with pdns_recursor 4

[Aki Tuomi]

http://dnsviz.net/d/bankofsingapore.com/dnssec/

it looks rather wild

Aki


On 20.07.2017 16:00, Christian Renner wrote:
> Hi
>
> We currently face issues in resolving bankofsingapore.com with all our PDNS 4 installations (4.0.4 and 4.0.6). Sometimes resolving works, sometimes not (retrieving servfail):
>
> root at icarus:~# rec_control wipe-cache bankofsingapore.com; dig ns bankofsingapore.com +short
> wiped 1 records, 0 negative records, 1 packets
> root at icarus:~# rec_control wipe-cache bankofsingapore.com; dig ns bankofsingapore.com +short
> wiped 1 records, 0 negative records, 1 packets
> ns2.bankofsingapore.com.
> ns1.bankofsingapore.com.
> root at icarus:~# rec_control wipe-cache bankofsingapore.com; dig ns bankofsingapore.com +short
> wiped 1 records, 1 negative records, 1 packets
> ns2.bankofsingapore.com.
> ns1.bankofsingapore.com.
> root at icarus:~# rec_control wipe-cache bankofsingapore.com; dig ns bankofsingapore.com +short
> wiped 1 records, 1 negative records, 1 packets
>
> root@ icarus:~# rec_control top-servfail-queries
> Over last 68 entries:
> 61.76%	bankofsingapore.com.|NS
> 36.76%	bankofsingapore.com.|MX
> 1.47%	ns2.bankofsingapore.com.|A
>
> Resolving the mx records of bankofsingapore.com never works with our PDNS 4 instances while all that stuff works with PDNS 3 and Unbound.
>
> Someone here with a good idea how to debug this problem?
>
> Regards
> Christian
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