cutter - cut tcp/ip connections
cutter ipaddress1 [ port1 [ ipaddress2 [ port2 ] ] ]
Cutter is an open source program that allows Linux firewall
administrators to abort TCP/IP connections routed over the firewall or
router on which it is run.
Cutter has been designed for use as a administrators tool for Linux
firewalls. It’s use (as is, or modified) for any other purpose is not
sanctioned by the author. So - do not use this tool as a parachute, or
to dry your cat, chill meat, answer your phone, drive you car, teach
your kids to read or attack other people’s computer systems or
This software has been designed for legal and appropriate use by
network security administrators and the like. It has been written as
part of a larger Linux firewall project, targetting at controlling
traffic from peer-to-peer software such as Kazaa, iMesh and others into
and out of a private network. It is not designed as a tool for
malicious use and the author in no way sanctions such use.
Users of the software should be aware that it’s actions are easily
detectable using a number of readily available network monitoring
tools, and it makes no attempt to disguise it’s actions. Malicious use
of "cutter" could result in a jail sentance in a number of countries
around the world.
The author is not responsible for the results of using this software.
It is provided "as is" in the hope that it will be useful, but no
garantees are made about it’s use.
Cutter can be called using one of the following four syntaxes.
Cuts all connections passing through the firewall between any
ports on the specified ip-address (either a "private" or
"public" address) and any other hosts. This can be used to close
down all incoming connections to a particular server, all
outgoing connections from a particular client or all outgoing
connections to a server.
cutter ip-address port
cutter 220.127.116.11 80
Cuts all connections to or from the specified ip-address/port
pair. This allows the user to be a little more specific than the
previous example and allows targetting of specific services on
cutter ip-address-1 port-1 ip-address-2
cutter 18.104.22.168 22 10.10.0.45
Cuts all connections between ip-address-2 and ip-
address-1/port-1. This allows the user to cut connections
between a specified "client" and a particular service on a
specified host. Our example closes host 10.10.0.45’s SSH
connection to server 22.214.171.124.
cutter ip-address-1 port-1 ip-address-2 port-2
cutter 126.96.36.199 22 10.10.0.45 32451
Cuts the specific connection between the two ip/port number
Cutter 1.03 should be considered EXPERIMENTAL. The author is releasing
a tool that works on the systems he has access to (namely: IPCop and
RedHat Linux), and he is seeking input on it’s use on other systems,
ideas for improvement, offers of sponsorship - etc.
This program is documented at http://www.lowth.com/cutter/
Blars Blarson addapted the README and web page written by Chris Lowth
into this man page for debian package of cutter. This man page may be
distribuated under the terms of the Gnu GPL version 2.