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Posts in 2017

  • HA Recursive DNS with dnsdist and exabgp

    Thursday, February 02, 2017 in DNS

    This is a fourth in blog series about DNS, specifically awesome things that can be done with dnsdist. This one was inspired by this blog post about exabgp and healthchecks, as well as this custom lua dnsdist load balancing policy. Routing, Front and …

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Posts in 2016

  • HA Authoritative DNS w/ dnsdist

    Saturday, August 13, 2016 in DNS

    I ran into an obscure limitation in PowerDNS 4.0 authoritative server recently. I have one nameserver which also acts as a slave to two other sets of zones with are transfered using AXFR. Some of those zones are DNSSEC enabled, and PowerDNS is only …

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  • dnsdist with pdns recursors

    Monday, August 01, 2016 in DNS

    This is a second in blog series about DNS, specifically awesome things that can be done with dnsdist. Front and Back Ends 2x dnsdist load balancers as client facing DNS resolvers 2x PowerDNS recursor backends Norway Spruce Picea abies shoot with …

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  • Load Balancing DNS with dnsdist

    Saturday, May 07, 2016 in DNS

    I first came across dnsdist in a NANOG post in the discussion of exploitation of a BIND DOS bug last summer. Jared Mauch had recommended dnsdist to easily implement DNS backend diversity. I was interested at the time. but wasn’t doing enough …

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Posts in 2014

  • check-soa

    Saturday, June 14, 2014 in DNS

    As you can see, it supports ipv4/ipv6: $ check-soa -i ciscodude.net ns0.ciscodude.net. 2604:4280:d000:11::6: OK: 2014061301 (0 ms) 199.202.21.6: OK: 2014061301 (0 ms) ns2.henchman21.net. 107.170.63.61: OK: 2014061301 (44 ms) ns3.hcdn.pw. …

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  • GeoDNS

    Monday, June 02, 2014 in DNS

    I’ve been wanting to play with GeoDNS to direct clients to servers with content nearer to them for a long time. It seems that I’ve got two different options to explore, Bind GeoIP patches and abh/geodns a GeoDNS server written in Go. One …

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