A useful page of online tools for discovering information about machines and domains on the Internet
Wininternals have the shareware tools, sysinternals has the cut down (but nevertheless very useful) free tools. There
are alot of things here for those who like to delve in to the technicalities of their PCs. As far as computer security goes,Of particular interest are the TCPView tools which provide information as to what processes are accessing the TCP/IP stack on the computer.
Saying that, much of the information which you get from TCPView Pro can be got for free if you're running Tiny Personal Firewall
http://www.visualware.com/visualroute/index.html
VisualRoute is an attractive graphical tool for tracing the path of packets across the internet. It also provides quite a bit more info than normal traceroute tools. It can be very useful for running attacking computers to ground so that a compliant can be sent to the relevant ISP. It is also good fun
http://www.switch.ch/network/services/
Useful Network Services such as Traceroute, Looking Glass etc...
http://www.iana.org/cctld/cctld-whois.htm
Whois is a system of information servers which allow you to track down who controls what domains and IP addresses. Invaluable for sleuthing firewall logs. Sam Spade includes a Whois client
If you want to give a network of computers access to the Internet via one 'phone line this piece of shareware is a good tool for the job. Using NAT also provides a useful level of security to the computers sharing the connection
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