Tor: An anonymous Internet communication system
Tor is a toolset for a wide range of organizations and people that want to improve their safety and security on the Internet. Using Tor can help you anonymize web browsing and publishing, instant messaging, IRC, SSH, and other applications that use the TCP protocol. Tor also provides a platform on which software developers can build new applications with built-in anonymity, safety, and privacy features.
You mean blocking ICMP echo replies to the echo requests made by a host at the firewall end?prevent ohters from pinging
ya i was talking bout the ping ... if ur on a firewall or so, thats when you get the destination unreachable as you read . where it does allow others to snoop around is by using finger or proggies like netstat,blackhat tools, etc which are drastically handicapped if u have a firewall where they would otherwiesget info on OS used ,etc.thats the point... Its still possible even with a firewall ,but i'll leave that to the networking guru's....a echo reply is expected by a host sending them.Be the reply whatever destination unreachable,host unreachable...