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New DNS resolvers

August 28th, 2013 by

We’ve upgraded our DNS resolvers in our SOV and HEX data centres. New features include DNSSEC validation and IPv6.

The addresses are,

SOV : 2a00:1098:0:80:1000::12 / 93.93.128.2
HEX : 2a00:1098:0:82:1000::10 / 93.93.130.2

They’re now DNSSEC aware and validating resolvers. That means if a site has correctly configured DNSSEC and we receive an answer that fails the security check we will return no answer rather than an incorrect/forged one.

To demonstrate the difference,

a non dns sec validating resolver :
# dig +short sigfail.verteiltesysteme.net
134.91.78.139

a mythic beasts server using our resolvers
# dig +short sigfail.verteiltesysteme.net
<no answer>
#

and on the DNS server it logs an error,

debug.log:28-Aug-2013 15:44:57.565 dnssec: info: validating @0x7fba880b69e0: sigfail.verteiltesysteme.net A: no valid signature found

and correctly drops the reply.

Googles DNS servers on 8.8.8.8 work the same as ours so we’re fairly confident that there will be no compatibility issues.

Posted in IPv6, Network