The Address (A) record associates a domain name or subdomain with an IP address, which is the primary purpose of the DNS system. The @ sign identifies "this domain;" for example, A @ nnn.nnn.nnn.nnn ...

We have a Windows 2003 server that serves DNS requests to our clients. It caches web requests. We're seeing a strange issue crop up from time to time and right now it's easily reproducible - external ...

Aging is a feature that allows identifying stale DNS records. It actually uses two intervals and a DNS record is considered as stale once both are elapsed. These intervals are: Non-Refresh Interval: ...

The internet runs on protocols that most people never think about. DNS, the Domain Name System, is one of them. It quietly powers everything from checking your email to streaming your favorite show.

Businesses can create a sender policy framework (SPF) record on a domain to detect email spoofing and block spam. The SPF record defines authorized mail servers in the domain name system; if the ...

The DNS CNAME is one of the most versatile tools in an IT administrator’s arsenal. One caveat to reaching the full potential of a CNAME is default TTL. IT pro Rick Vanover explains situations to lower ...

This may be more than just a Linux question, but since my servers are Linux, away we go!<BR><BR>I've got a couple servers running Red Hat, with a whole pile of internet domains on them. Each domain ...

Each time you open a browser and type in a web address, there’s a hidden hand sending all the information to your PC to render the page as it should. Those middle-men of your newly loaded webpage are ...