CUTTER and TCPKILL command in Linux

Linux Cutting the tcp/ip network connection with cutter command

Cut all connections from 192.168.1.5 to server
# cutter 192.168.1.5

Cut all ssh connection from 192.168.1.5 to server
# cutter 192.168.1.5 22

Cut all ssh connection from 192.168.1.5 to ssh server 202.54.1.20
# cutter 202.54.1.20 192.168.1.5 22

How to kill a TCP connection?


Use tcpkill command to kill specified in-progress TCP connections. It is useful for libnids-based applications which require a full TCP 3-whs for TCB creation.
Syntax:

tcpkill -i eth0 { expression }

Examples:

(a) Kill all outgoing ftp (port 21) connection:

tcpkill -i eth0 port 21

(b) Kill all all packets arriving at or departing from host 192.168.1.2 (host12.nixcraft.com)

tcpkill host 192.168.1.2