Firewall with iptables using mac address filtering in linux !

There are times when you might need to filter the traffic on your firewall using MAC addresses instead of IP addresses, iptables has the option to do it. From the man page of iptables: Note that this only makes sense for packets coming from an Ethernet device and entering the PREROUTING, FORWARD or INPUT chains. [...]

Nmap – How To : Scan Hosts Of Networks For Open Ports !

Nmap is a wonderful tool specially for debugging, there are lots of times when you need to know if a port is open in a server, or maybe blocked by a firewall, or just to test your iptables rules. Here we will learn how to use it at the command line, and using its GUI [...]

Anti-virus Softwares for Linux

AMaVis : (e-mail Virus Scanner) It scans e-mail attachments for viruses using third-party virus scanners available for Linux. It Supports courier, exim, qmail, postfix, and sendmail. Built-in defense against Denial of Service (DoS) attacks sudo apt-get install amavis-stats Avast! : It is an anti-virus program from ALWIL Software based in Prague. This is a freeware [...]

gshutdown : Graphical Shutdown Utility in Ubuntu

gshutdown is a Graphical Shutdown Utility, you can set the shutdown /restart time graphically. Beginners can easily schedule shutdown time using this utility. $ sudo apt-get install gshutdown ( or use synaptic package manager)

Howto : Password Protect Grub in Ubuntu/Debian Linux

Some recent posts showing that your linux box is not secure unless you installed a grub Password. If you are an administrator of a highly sensitive server, you must do it. To add a password for grub, first you must generate an md5 password hash using the grub-md5-crypt utility: grub-md5-crypt The command will ask you [...]