DNS Scavenging

April 27, 2012 Leave a comment

Most of you reading this will already know what DNS Scavenging is. For those of you that don’t it is a feature of Windows DNS servers which allows you to automate the deletion (scavenge) of outdated DNS resource records. It sounds simple enough and it is once you decipher Microsoft’s cryptic descriptions, but to the uninitiated it is just plain confusing and often leads to unpredictable results. This article will attempt to simplify how DNS scavenging works.

Enabling DNS Scavenging on Zones

The first thing we need to do is enable Scavenging. This is done separately for each DNS zone. Read more of this post

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DNS Zones Explained

June 11, 2011 3 Comments

Recently I was doing a bit of promotional work for my blog by participating in some IT related forums. I was going through the post as you do when an interesting question came up. The poster was reading up on about DNS Zones, what their purpose is and how they work. He was having trouble understanding the following paragraph in a study book he was reading:

A DNS zone contains all the domain names the domain with the same domain name contains,
except for domain names in delegated subdomains. For example, the top-level
domain ca (for Canada) has subdomains called ab.ca, on.ca, and qc.ca, for the provinces
Alberta, Ontario, and Quebec. Authority for the ab.ca, on.ca, and qc.ca
domains may be delegated to nameservers in each province. The domain ca contains
all the data in ca plus all the data in ab.ca, on.ca, and qc.ca. However, the zone ca
contains only the data in ca (see Figure 2-10), which is probably mostly pointers to
the delegated subdomains. ab.ca, on.ca, and qc.ca are separate zones from the ca
zone.

Can you understand that?? No wonder he was having trouble, Read more of this post

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