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…
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 = www.example.com Read more…
highest node in tree is = .com
next (lower) = .example
next (lower) = www
If nslookup fails on CentOS, you may need to install bind utilities: Read more…
SIGTERM vs. SIGKILL
Sending signals to processes using kill on a Unix system is not a new topic for most systems administrators, but I’ve been asked many times about the difference between kill and kill -9. Read more…
ngrep is a “network grep” utility that can be used to match regular expressions within network packet payloads. This is a very handy utility as many network analysers (“packet sniffers”) can examine the packet header, but either do not display or cannot filter based on packet payload. Read more…
A simple point-and-click utility enabling you to automagically download and install a choice of Linux distributions. Install Linux on USB partitions as small as 128Mb.
Oracle Finalises deal to acquire Sun
An announcement on their website (http://www.oracle.com/us/sun/index.htm ) states:
“we plan to engineer and deliver open and integrated systems—from applications to disk—where all the pieces fit and work together out of the box.”
(Note the use of small “o” in “Open”)
“A big part of the Internet is built on LAMP (Linux, Apache, MySQL and PHP/Perl/Python). Now Oracle is trying to buy Sun, which owns MySQL. Read more…
The IEEE has finally ratified the 802.11n standard, see the press release here
The quiz asks questions such as whether participants plan to use wireless devices, how they rate their technical skills and whether they are installing the operating system on a desktop or portable computer.
Once the quiz is complete, the applications recommends one particular Linux distribution and lists a number of alternative distributions, along with the criteria they failed on.
Linux Distribution Chooser [zegenie Studios]
Linux Lab Scripting Fundamentals (download MS Word / OpenOffice document)
