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VDETAPLIB(1)							  VDETAPLIB(1)

NAME
       vdetaplib - Virtual Distributed Ethernet tap emulation library

SYNOPSIS
       No synopsis

DESCRIPTION
       vdetaplib  is a library that emulates tap (tuntap level2 interface, see
       in kernel sources Documentation/networking/tun.c) and connects tap vir‐
       tual interfaces to vde networks.

       To  use it, the libvdetab.so library must be preloaded (sh, ksh or bash
       syntax):
	      export LD_PRELOAD=/usr/lib/vde2/libvdetap.so
       (csh, tchs syntax):
	      setenv LD_PRELOAD /usr/lib/vde2/libvdetap.so

       If you want to divert all tap requests to a single vde_switch  set  the
       variable VDEALLTAP to the vde socket.
       (sh, ksh or bash syntax):
	      export VDEALLTAP=/tmp/vde.ctl
       (csh, tchs syntax):
	      setenv VDEALLTAP /tmp/vde.ctl

       It  is  possible to set each single interface to different vde_switches
       by setting the environment variable with the same name  of  the	inter‐
       face.
       (sh, ksh or bash syntax):
	      export tap0=/tmp/vde.ctl
	      export tap1=/tmp/myvde.ctl
	      export ppc=/tmp/ppc.ctl
       (csh, tchs syntax):
	      setenv tap0 /tmp/vde.ctl
	      setenv tap1 /tmp/myvde.ctl
	      setenv ppc /tmp/ppc.ctl

       It  is  also possible to specify port, group or mode for a given inter‐
       face setting environment variables as in the following example.
       (sh, ksh or bash syntax):
	      export tap0_port=5
	      export tap0_group=vde-net
	      export tap0_mode=0660
       (csh, tchs, syntax):
	      setenv tap0_port 5
	      setenv tap0_group vde-net
	      setenv tap0_mode 0660

       The variable to set  the	 specific  interface  is  checked  first  then
       VDEALLTAP.  VDEALLTAP thus works as a default choice for the vde switch
       to be used.  If VDEALLTAP is not set and there is no specific  environ‐
       ment  variable  (and for tun -- IFF_TUN interfaces) the kernel provided
       interface is used.  In this  latter  case  access  to  /dev/net/tun  is
       required, generally root access.

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 Tech‐
       nologies").

SEE ALSO
       vde_switch(1), vdeq(1).

AUTHOR
       VDE is a project by Renzo Davoli <renzo@cs.unibo.it>

Virtual Distributed Ethernet   December 6, 2006			  VDETAPLIB(1)

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