Blogs

  • 2014 Annual Report

    Letter from the President   We are now a trimmer and more functional organization, with financial controls, stability and predictability. We determined that BIND revenues had been subsidizing our other efforts, so we put more back into BIND, adding three DNS engineers in early 2015. On the operations side, we are cutting back on subsidized programs that no longer make

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  • Resolver DDOS Mitigation

    Early in 2014 a couple of our BIND support customers told us about some intermittent periods of very heavy query activity that swamped their resolvers and asked us for help. It emerged that these were just the first signs of a long series of similar DDOS (Distributed Denial of Service) attacks that began in early 2014 and are continuing today around the Internet.

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  • Benchmarking DNS Reliably on Multi-core Systems

    Introduction As part of an ongoing study into DNS server performance, we wanted to establish a baseline figure for the absolute maximum throughput that can be achieved using standard APIs.  To this end we have developed a tiny DNS server that does nothing except echo the received packet back to the client, albeit with the “QR” bit flipped to indicate

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  • How Facebook is using Kea in the datacenter

      Angelo Failla, Production Engineer, Facebook Why did Facebook need a new DHCP solution? We use dhcp for provisioning servers in our production datacenters. We use it both for bare metal provisioning, (to install the operating system) and to assign addresses to the out of band management interfaces. Our old system was based on ISC dhcpd and static configuration files generated

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  • CVE-2015-4620: Specially Constructed Zone Data Can Cause a Resolver to Crash when Validating

    An attacker who can cause a validating resolver to query a zone containing specifically constructed contents can cause that resolver to fail an assertion and terminate due to a defect in validation code. The Knowledge Base article https://kb.isc.org/article/AA-01267 is the complete and official security advisory document. What is posted below is a snapshot of that document.   CVE: CVE-2015-4620 Document Version:  2.0 Posting

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Last modified: January 30, 2014 at 12:11 pm