xref: /freebsd/usr.sbin/tcpdrop/tcpdrop.8 (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1.\"	$OpenBSD: tcpdrop.8,v 1.5 2004/05/24 13:57:31 jmc Exp $
2.\"
3.\" Copyright (c) 2004 Markus Friedl <markus@openbsd.org>
4.\"
5.\" Permission to use, copy, modify, and distribute this software for any
6.\" purpose with or without fee is hereby granted, provided that the above
7.\" copyright notice and this permission notice appear in all copies.
8.\"
9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16.\"
17.\" $FreeBSD$
18.\"
19.Dd March 21, 2004
20.Dt TCPDROP 8
21.Os
22.Sh NAME
23.Nm tcpdrop
24.Nd drop a TCP connection
25.Sh SYNOPSIS
26.Nm tcpdrop
27.Ar laddr
28.Ar lport
29.Ar faddr
30.Ar fport
31.Sh DESCRIPTION
32The
33.Nm
34command drops the TCP connection specified by the local address
35.Ar laddr ,
36port
37.Ar lport
38and the foreign address
39.Ar faddr ,
40port
41.Ar fport .
42Addresses and ports can be specified by name or numeric value.
43.Sh EXIT STATUS
44.Ex -std
45.Sh EXAMPLES
46If a connection to
47.Xr httpd 8 Pq Pa ports/www/apache2
48is causing congestion on a network link, one can drop the TCP session
49in charge:
50.Bd -literal -offset indent
51# sockstat -c | grep httpd
52www      httpd      16525 3  tcp4 \e
53	192.168.5.41:80      192.168.5.1:26747
54.Ed
55.Pp
56The following command will drop the connection:
57.Bd -literal -offset indent
58# tcpdrop 192.168.5.41 80 192.168.5.1 26747
59.Ed
60.Sh SEE ALSO
61.Xr netstat 1 ,
62.Xr sockstat 1
63.Sh AUTHORS
64.An Markus Friedl Aq markus@openbsd.org
65