04-18-2002
A firewall is yet another item that can be not only fingerprinted, but exploited and bypassed, only to hit that much harder on admins lulled into a false sense of security...
For example, look at the recent developments with fragroute vs. snort. It can be used to perform very common attacks right under snort's nose without even a whimper... I realize that snort is probably not what you had in mind, but I am willing to bet this becomes a very widely used attack tool to bypass both IDS and firewalls completely, until a better solution is attained.
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LEARN ABOUT DEBIAN
tcpconnect
TCPCONNECT(1) General Commands Manual TCPCONNECT(1)
NAME
tcpconnect - general TCP/IP client
SYNOPSIS
tcpconnect [-irv] [-l localaddr] host port
DESCRIPTION
tcpconnect creates a TCP/IP connection to a server running on the machine host, listening to port port. It then reads standard input and
sends to the remote server, and data received from the server is printed to standard output. When end-of-file is reached on both standard
input and the TCP/IP connection, tcpconnect terminates.
OPTIONS
-i Terminate at end-of-file on standard input; don't wait for the server to close the connection.
-r Terminate when the remote server closes the connection; don't wait for end-of-file on standard input.
-v Verbose mode. Prints a message to standard error when the connection has been established.
-l addr:port
Bind the local end-point of the connection to IP address addr, TCP port port. Either the IP address or the port, but not both, may
be left out, meaning that the operating system gets to choose that part by itself.
SEE ALSO
tcplisten(1), telnet(1), tcpbug(1).
BUGS
The names of the options are not yet finalized, and may change at a future release.
1997 April 13 TCPCONNECT(1)