TCPDROP(8)		  BSD System Manager's Manual		    TCPDROP(8)

NAME
     tcpdrop — drop TCP connections

SYNOPSIS
     tcpdrop local-address local-port foreign-address foreign-port
     tcpdrop [-l] -a

DESCRIPTION
     The tcpdrop command may be used to drop TCP connections from the command
     line.

     If -a is specified then tcpdrop will attempt to drop all active connec‐
     tions.  The -l flag may be given to list the tcpdrop invocation to drop
     all active connections one at a time.

     If -a is not specified then only the connection between the given local
     address local-address, port local-port, and the foreign address
     foreign-address, port foreign-port, will be dropped.

     Addresses and ports may be specified by name or numeric value.  Both IPv4
     and IPv6 address formats are supported.

     The addresses and ports may be separated by periods or colons instead of
     spaces.

EXIT STATUS
     The tcpdrop utility exits 0 on success, and >0 if an error occurs.

EXAMPLES
     If a connection to httpd(8) is causing congestion on a network link, one
     can drop the TCP session in charge:

	   # sockstat -c | grep httpd
	   www	    httpd      16525 3	tcp4 \
		   192.168.5.41:80	192.168.5.1:26747

     The following command will drop the connection:

	   # tcpdrop 192.168.5.41 80 192.168.5.1 26747

     The following command will drop all connections but those to or from port
     22, the port used by sshd(8):

	   # tcpdrop -l -a | grep -vw 22 | sh

SEE ALSO
     netstat(1), sockstat(1)

AUTHORS
     Markus Friedl ⟨markus@openbsd.org⟩
     Juli Mallett ⟨jmallett@FreeBSD.org⟩

BSD			       January 30, 2013 			   BSD