Back to Newsletters KEYWORDS= Davrom Consulting Newsletter - Issue # 48 - Dated: 23 Dec 2010 From the desk of David Clark To all of our customers and readers of the Davrom newsletter I would like to take this opportunity to wish you a very Merry Christmas and a Happy and Prosperous New Year. We sincerely appreciate your business and thank you for your continued use of our services. Once again we will only be closed for the actual public holidays so if you need us, we will be here. For those who remember the old ASCII Christmas tree that I have been using for the past 20 odd years, here it is again.
#########################################
## \ / ##
## ##
## * ##
## $ ##
## /o\ ##
## /\ *\ ##
## /o*/o/\ ##
## /*/\ *\o\ ##
## /\o*\/o\/*\ ##
## /\/*/o\ /*\o\ ##
## /*/\/\ /*o/\/*\ ##
## o o # o o ##
## # ##
## __#__ __%__ ##
## \_____/ |_____| ##
## ##
## / Merry Christmas From Davrom \ ##
#########################################
I would like to thank the reader for their time in reading this newsletter. David.M.Clark UNIX Quote Linux since 1991; UNIX since 1969. And all still going strong. Virus Protection As you know Linux doesn't get viruses and most Linux issues are caused by humans directly rather than by some malicious software that has been able to root itself on the PC. But having worked with a few Windows PCs over the past months with some very nastly viruses, I have found that the purchased versions of anti-virus software work much better than the free versions. I myself have installed a version of Kaspersky Anti-Virus after removing a free anti-virus software on a Windows PC some years ago and it found trojans on the PC whereas the free version had not - and it was up to date in its virus signatures before I opted for Kaspersky, so I was concerned the free version did not found them. I tend to only use the anti-virus software and not the whole security centers that some of them provide as I find these tend to block important ports so things like outbound e-mail cannot be sent because of a 'security' decision. If you are aware of these kinds of manual intervention requirements, then certainly get the extra featured product, but in our office there has been running a variety of Kaspersky and Nortons anti-virus solutions for some years now, and have remained virus free to date. Just worth considering as two sites I look after have recently had major virus issues and were basically not protected. Tech Tip Some years ago I wrote a shell program to try and discover what IP addresses were in use on a given network, but as always in UNIX/Linux you can end up stumbling upon a much better command or utility that someone has since written, that can do the job much more quickly and efficiently. Sometimes these programs have been there all along, but you just haven't found them yet. On Linux servers you can use the nmap command to discover very quickly what IP addresses appear to be in use on your network. A simple execution of the following command will show you what IP addresses are in use on a network with a network IP address of 192.168.1 in a C-class subnet mask of 255.255.255.0. nmap -v -sP 192.168.1.0/24 | more The output will show you if the IP appears to be down, appears to be up and if it an entry for the IP address appears in the /etc/hosts file, it will show both the node name and the IP address. Back to Newsletters 
Website design by Davrom Consulting Pty Ltd This site is fully tested with Google Chrome and Firefox web bowsers Home Page | Support | Misc | David's Pages | Podcasts | Contact Us | Blog |
