Lars-Johan Liman, M.Sc., works as Senior Systems Specialist at Netnod in Stockholm, Sweden. He is responsible for Netnod's root name service for the Domain Name System (DNS), and has spent more than 30 years plumbing and tinkering with the DNS. Over time he has worked with just about every aspect of the DNS you can imagine – operation, configuration, provisioning, engineering, testing, debugging, documentation, design and evolution, international cooperation and governance, teaching, and even joking with it. He is and has been a member (and sometimes chair) of a plethora of committees and working groups in fora related to the DNS, such as ICANN (the Customer Standing Committee [chair], the Root Server System Advisory Committee [chair], the Root Server System Governance Working Group, the IANA Transition Working Group, the Root Scaling Study Working Group, the IANA Functions Review Team 2, the Registry Technical Evaluation Panel, the IETF (DNS Operations Working Group [chair], DNS Extensions Working Group, the DNS Directorate, etc), the RIPE community (the DNS Working Group), DNS-OARC, CENTR, and more.
Everyone knows that signing your DNS zones is a good idea. However, DNSSEC can cause problems when combined with a widely used method for synchronising secondary DNS servers with their primaries, Incremental Zone Transfer (IXFR). Find out why IXFRs are useful and what you need to know to use them t…
If you know about DNS, you've probably heard of the Time-to-Live (TTL) field. But mistakes with TTL are more common than you might think. Here we look at the quirks of DNS record sets, parent/child domains and how to avoid TTL problems.
The root name servers are a critical part of the Internet’s infrastructure. Identified by letters A through M, they provide the entry points to the Domain Name System (DNS). Since 2000, Netnod has operated i.root-servers.net, the first root server to be located outside of the United States.