.\" $NetBSD: tcpdrop.8,v 1.1 2007/06/25 23:34:52 christos Exp $ .\" .\" Copyright (c) 1989, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" Herb Hasler and Rick Macklem at The University of Guelph. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $OpenBSD: tcpdrop.8,v 1.6 2006/01/03 14:52:17 jmc Exp $ .\" .\" Copyright (c) 2004 Markus Friedl .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .Dd June 23, 2007 .Dt TCPDROP 8 .Os .Sh NAME .Nm tcpdrop .Nd drop a TCP connection .Sh SYNOPSIS .Nm tcpdrop .Ar laddr .Ar lport .Ar faddr .Ar fport .Sh DESCRIPTION The .Nm command drops the TCP connection specified by the local address .Ar laddr , port .Ar lport and the foreign address .Ar faddr , port .Ar fport . Addresses and ports can be specified by name or numeric value. .Sh EXAMPLES If a connection to .Xr httpd 8 is causing congestion on a network link, one can drop the TCP session in charge: .Bd -literal -offset indent $ fstat | grep 'httpd.*internet.*\*(Lt--' www httpd 21307 3* internet stream tcp \e 0xd1007ca8 192.168.5.41:80 \*(Lt-- 192.168.5.1:26747 .Ed .Pp The following command will drop the connection: .Bd -literal -offset indent # tcpdrop 192.168.5.41 80 192.168.5.1 26747 .Ed .Sh SEE ALSO .Xr fstat 1 , .Xr netstat 1