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freebsd-skq/usr.sbin/tcpdrop/tcpdrop.8

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o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.\" $OpenBSD: tcpdrop.8,v 1.5 2004/05/24 13:57:31 jmc Exp $
.\"
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.\" Copyright (c) 2009 Juli Mallett <jmallett@FreeBSD.org>
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.\" Copyright (c) 2004 Markus Friedl <markus@openbsd.org>
.\"
.\" 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.
.\"
.\" $FreeBSD$
.\"
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.Dd March 24, 2009
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.Dt TCPDROP 8
.Os
.Sh NAME
.Nm tcpdrop
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.Nd drop TCP connections
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.Sh SYNOPSIS
.Nm tcpdrop
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.Ar local-address
.Ar local-port
.Ar foreign-address
.Ar foreign-port
.Nm tcpdrop
.Op Fl l
.Fl a
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.Sh DESCRIPTION
The
.Nm
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
command may be used to drop TCP connections from the command line.
.Pp
If
.Fl a
is specified then
.Nm
will attempt to drop all active connections.
The
.Fl l
flag may be given to list the tcpdrop invocation to drop all active
connections one at a time.
.Pp
If
.Fl a
is not specified then only the connection between the given local
address
.Ar local-address ,
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
port
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.Ar local-port ,
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
and the foreign address
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.Ar foreign-address ,
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
port
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.Ar foreign-port ,
will be dropped.
.Pp
Addresses and ports may be specified by name or numeric value.
Both IPv4 and IPv6 address formats are supported.
.Nm
in case of success or failure.
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
If a connection to
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.Xr httpd 8
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
is causing congestion on a network link, one can drop the TCP session
in charge:
.Bd -literal -offset indent
o Improve the example a bit. Submitted by: hrs
2005-03-14 14:12:29 +00:00
# sockstat -c | grep httpd
o Replace OpenBSD-specific example by FreeBSD's one. Noticed by: Daniel O'Connor
2005-03-14 12:15:43 +00:00
www httpd 16525 3 tcp4 \e
192.168.5.41:80 192.168.5.1:26747
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.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
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.Pp
The following command will drop all connections but those to or from
port 22, the port used by
.Xr sshd 8 :
.Bd -literal -offset indent
# tcpdrop -l -a | grep -vw 22 | sh
.Ed
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.Sh SEE ALSO
Sort xrefs
2005-03-14 12:24:34 +00:00
.Xr netstat 1 ,
.Xr sockstat 1
o Implement net.inet.tcp.drop sysctl and userland part, tcpdrop(8) utility: The tcpdrop command drops the TCP connection specified by the local address laddr, port lport and the foreign address faddr, port fport. Obtained from: OpenBSD Reviewed by: rwatson (locking), ru (man page), -current MFC after: 1 month
2005-02-06 10:47:12 +00:00
.Sh AUTHORS
.An Markus Friedl Aq markus@openbsd.org
o) Restructure tcpdrop(8) to provide a facility to try to drop all established 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.
2009-06-01 06:49:09 +00:00
.An Juli Mallett Aq jmallett@FreeBSD.org
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