[dns-operations] DNS version request

Peter van Dijk peter.van.dijk at powerdns.com
Fri Dec 7 21:19:04 UTC 2018

On 7 Dec 2018, at 21:46, Warren Kumari wrote:

> On Fri, Dec 7, 2018 at 1:42 AM Ray Bellis <ray at isc.org> wrote:
>> There's plenty of ALGs in home CPE pretending to be a DNS server that
>> blindly forward CH queries to the back-end resolver that they're
>> configured to talk to.
> ... and I must admit, with much embarrassment, that that has tripped 
> me up
> once or twice. I've been at a hotel which was doing weird DNS stuff, 
> but CH
> records were passed through unmolested -- this made troubleshooting
> trickier because I assumed the problem was elsewhere...

In similar vein, a few years ago I looked at some ‘open resolver’ 
report that included version.bind output, and I found that just a couple 
of days after we released a PowerDNS update, literally tens of thousands 
of open resolver on the Internet had upgraded to it.

They hadn’t - they were CPEs, forwarding blindly as above, even for 
queries coming in on their outside/WAN interface.

Kind regards,
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/

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