How do I break an arbitrary TCP/IP connection on Linux?

Question

Is there any command that can be used to break an existing TCP/IP connection from some program?

Is there anything in a TCP connection the OS is aware of, or do the

Answer 1

Cutter

Cutter will send packets to both ends of a TCP/IP connection to close the connection. It is designed to be used on a Linux router to disconnect unwanted connections.

Website: http://www.digitage.co.uk/digitage/software/linux-security/cutter

Debian has a package of it: https://packages.debian.org/stable/cutter