Archive for August, 2011

Preventing DNS Zone Transfers using ACLs in named.conf

August 31st, 2011 No comments

DNS servers can be attacked using various techniques including:

  • DNS spoofing
  • Cache poisoning
  • Registration hijacking

One of the simplest ways to defend is to strictly limit zone transfers between nameservers by defining an ACL. Many system administrators allows BIND to transfer zones in bulk outside of their network or organisation. This is an attack vector.  You can prevent this by using ACLs: Read more…

Categories: DNS and BIND, linux Tags:

DNS and BIND – Quick Setup

August 30th, 2011 No comments

Create /etc/named.conf file specify the directory location of other files used by DNS: Read more…

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DNS Record Types Explained

August 26th, 2011 No comments

A Record

The majority of DNS records are “A” records. A records allow for you to point different sections of your domain to different IP addresses or servers. For example, this would be useful for having “” point to your web server’s IP address and “” point to your mail server’s IP address. Each record includes a “Host Name” value and a corresponding IP Address. Read more…

Categories: DNS and BIND, linux Tags:

Understanding the Linux Startup Processes

August 17th, 2011 No comments

This is a link to a brief description of what happens in a Linux system, from the time that you turn on the power, to the time that you log in and get a bash prompt. Understanding this will be helpful when you need to solve problems or configure your system.
Greg O’Keefe,

Categories: linux Tags:

Verify My Riverbed RCSP-W Status

August 4th, 2011 No comments

Click to view Certificate in new window


Click to verify this using: VBCBEVSKCEF4QEQW

Categories: Uncategorized Tags: