
Staying Alive - What Is TTL and Why Is It Important for Your DNS Setup?


Lars-Johan Liman
Based in Stockholm, Sweden.
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 … More
• 6 min read
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.