c835ac218d
connections. Including a flag to instead output a sequence of tcpdrop(8) invocations that would accomplish the same thing, which is convenient for scripting. o) Make tcpdrop complain if the addresses given to it are entirely in different address families, rather than failing silently. o) When cross-referencing httpd(8), do not explicitly specify the apache2 port, since the example in question is generic.
97 lines
2.5 KiB
Groff
97 lines
2.5 KiB
Groff
.\" $OpenBSD: tcpdrop.8,v 1.5 2004/05/24 13:57:31 jmc Exp $
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.\"
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.\" Copyright (c) 2009 Juli Mallett <jmallett@FreeBSD.org>
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.\" Copyright (c) 2004 Markus Friedl <markus@openbsd.org>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 24, 2009
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.Dt TCPDROP 8
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.Os
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.Sh NAME
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.Nm tcpdrop
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.Nd drop TCP connections
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.Sh SYNOPSIS
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.Nm tcpdrop
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.Ar local-address
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.Ar local-port
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.Ar foreign-address
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.Ar foreign-port
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.Nm tcpdrop
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.Op Fl l
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.Fl a
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.Sh DESCRIPTION
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The
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.Nm
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command may be used to drop TCP connections from the command line.
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.Pp
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If
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.Fl a
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is specified then
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.Nm
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will attempt to drop all active connections.
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The
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.Fl l
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flag may be given to list the tcpdrop invocation to drop all active
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connections one at a time.
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.Pp
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If
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.Fl a
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is not specified then only the connection between the given local
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address
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.Ar local-address ,
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port
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.Ar local-port ,
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and the foreign address
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.Ar foreign-address ,
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port
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.Ar foreign-port ,
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will be dropped.
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.Pp
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Addresses and ports may be specified by name or numeric value.
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Both IPv4 and IPv6 address formats are supported.
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.Nm
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in case of success or failure.
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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If a connection to
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.Xr httpd 8
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is causing congestion on a network link, one can drop the TCP session
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in charge:
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.Bd -literal -offset indent
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# sockstat -c | grep httpd
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www httpd 16525 3 tcp4 \e
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192.168.5.41:80 192.168.5.1:26747
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.Ed
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.Pp
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The following command will drop the connection:
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.Bd -literal -offset indent
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# tcpdrop 192.168.5.41 80 192.168.5.1 26747
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.Ed
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.Pp
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The following command will drop all connections but those to or from
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port 22, the port used by
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.Xr sshd 8 :
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.Bd -literal -offset indent
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# tcpdrop -l -a | grep -vw 22 | sh
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.Ed
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.Sh SEE ALSO
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.Xr netstat 1 ,
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.Xr sockstat 1
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.Sh AUTHORS
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.An Markus Friedl Aq markus@openbsd.org
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.An Juli Mallett Aq jmallett@FreeBSD.org
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