This is really useful for me because I work with dozens of different database servers. The first thing I do is run this command and paste it into the servers /etc/my.cnf file. That way I will always know the original value and it just makes life much easier.
$ mysql -NBe 'SHOW VARIABLES' |sed 's,\t,^=,'|column -ts^|tr "\n" '@'|eval $(echo "sed '" "s,@\("{a..z}"\),\n\n\1,;" "'")|tr '@' "\n"|sed 's,^,# ,g'
Tons of awesome tips and tricks using netcat. Port redirector, nessus wrapper, capture exploits being sent by vuln scanners, etc. This is very useful for doing stuff like redirecting traffic through your firewall out to other places like web servers and mail hubs, while posing no risk to the firewall machine itself.
While testing the exploitability of your target and mapping out vulnerabilities it is important to gain access inside the targets defenses so that you can establish an internal foothold like a owned box or switch. This is so you can use a tool to discover the packet-filtering being used, and literally map out the firewall/IDS rules. Needless to say that really provides you with a lot more complete vulnerability assessment to help discover more weak spots in the system.
CURL Guide for sending POST data form request with PHP and CURL
Tor is a network of virtual tunnels that give you a very good level of anonymity, using Tor with privoxy and FoxTor for firefox gives you privacy at the touch of a button.