NAME
vde_plug - Virtual Distributed Ethernet plug (two plugs creates a vde
cable)
SYNOPSIS
vde_plug [ -p portnum ] [ -g group ] [ -m octal-mode ] [ socketdir ]
DESCRIPTION
A vde_plug is a plug to be connected into a VDE switch. All the data
that is catched by the plug is written in its stdout and everything
from stdin is injected in the switch.
This tool has been designed to be used together with dpipe (1) to
interconnect a second vde_plug to another switch, working as a virtual
ethernet crossed cable between the two switches.
The command
dpipe vde_plug = vde_plug /tmp/vde2.ctl
connects two local switches: the former is using the standard control
socket /tmp/vde.ctl while the latter is using /tmp/vde2.ctl.
The command
dpipe vde_plug = ssh remote.machine.org vde_plug
connects two remote switches. If the two vde_switches run as daemon
and they are connected to tap interfaces a level 2 encrypted tunnel is
established.
vde_plug can also be established as a login shell for users. The
following command works as in the previous example
dpipe vde_plug = ssh vdeuser@remote.machine.org vde_plug
where vdeuser is the user with vde_plug as standard shell. All the
remote accesses are logged by syslog at the beginning and at the end of
each session. Attempt to login without the command vde_plug at the end
or trying to execute something else are blocked and the attempt is
logged into syslog.
OPTIONS
-p portnum
It is possible to decide which port of the switch to use. When
this option is not specified the switch assigns the first
available unused port (if any). It is possible to connect
several cables in the same switch port: in this way all this
cables work concurrently. It means that packet can result as
duplicate but no ARP table loops are generated. Is useful when
vde is used for mobility. Several physical interfaces can be
used at a time during handoffs to prevent hichups in
connectivity.
-g group
group ownership of the communication socket. For security when
more want to share a switch it is better to use a unix group to
own the comm sockets so that the network traffic cannot be
sniffed.
-m octal-mode
octal chmod like permissions for the comm sockets
socketdir
(This option can be also set as: -sock socketdir ) specify the
directory which contains the UNIX socket to be used by local
programs for joining the VDE. The default value is
"/tmp/vde.ctl", which corresponds to the socket
"/tmp/vde.ctl/ctl".
NOTICE
Virtual Distributed Ethernet is not related in any way with www.vde.com
("Verband der Elektrotechnik, Elektronik und Informationstechnik" i.e.
the German "Association for Electrical, Electronic & Information
Technologies").
SEE ALSO
vde_switch(1), vde_plug2tap(1), vdeq(1), dpipe(1).
AUTHOR
VDE is a project by Renzo Davoli <renzo@cs.unibo.it>