Archive for January, 2011

DNS – Pointer Record (PTR)

January 30th, 2011 No comments

Pointer Record (PTR)

Pointer records are the opposite of A and AAAA RRs and are used in Reverse Map zone files to map an IP address (IPv4 or IPv6) to a host name. Read more…

Categories: DNS and BIND, linux Tags:

DNS – IN-ADDR.ARPA Reverse Mapping

January 30th, 2011 No comments

IPv4 IN-ADDR.ARPA Reverse Mapping Domain
We defined the normal domain name structure as a tree starting from the root. We write a normal domain name LEFT to RIGHT but the hierarchical structure is RIGHT to LEFT.

domain name =
highest node in tree is = .com
next (lower) = .example
next (lower) = www
Read more…

Categories: DNS and BIND, linux Tags:

Xen Hypervisor

January 29th, 2011 No comments

The Open Source Xen hypervisor runs directly on the hardware and becomes the interface for all hardware requests such as CPU, I/O, and disk for the guest operating systems.  By separating the guests from the hardware, the Xen hypervisor is able to run multiple operating systems securely and independently. Read more…

Categories: Computer Architecture Tags: ,

Creators of TCPDUMP, WinPcap, and Wireshark share their story

January 27th, 2011 No comments

At a recent Riverbed Technology event in Denver, Colorado, Steve McCanne, Loris Degioanni, and Gerald Combs shared the stage and told the story of the history behind their inventions TCPDUMP, WinPcap, and Wireshark. To view the video: Read more…