Blogs

  • 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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  • Partial EDNS compliance hampers deployment of new DNS features

    We at ISC want to encourage networking people around the Internet to focus attention for a few minutes on an obscure topic, EDNS compliance. EDNS is currently supported on better than 90% of all DNS servers ISC surveyed recently (research report). The percentage of DNS servers on the Internet that support EDNS drops significantly from 90% with some support, to 60 - 85% when you look at full compliance. As we add more applications that rely on EDNS, partial compliance can end up resulting in failures with increasingly significant impact. We cannot deploy DNS Cookies today without...

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  • Decommissioning the DLV

    The ISC DLV Registry has been available since 2006, and ISC has been happy to provide the service. However, due to the great progress that native DNSSEC has made, we have decided that it is time to wind down the project. If you have a zone already in DLV that could validate properly to the Root, we'd like you to remove it from DLV.

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  • Refinements to EDNS fallback behavior can cause different outcomes in Recursive Servers

    Recursive DNS Servers administrators have for many years been advised to ensure that both the servers that they are running and the network environments wherein those servers reside are RFC-compliant. This is to ensure the best possible outcome when handling client queries. While some older DNS implementations and/or mis-configured servers still fail to adhere to current standards, there are two

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