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VDETAPLIB(1)           DragonFly General Commands Manual          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
       virtual interfaces to vde networks.

       To use it, the libvdetab.so library must be preloaded (sh, ksh or bash
       syntax):
              export LD_PRELOAD=/usr/local/lib/vde2/libvdetap.so
       (csh, tcsh syntax):
              setenv LD_PRELOAD /usr/local/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, tcsh 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
       interface.
       (sh, ksh or bash syntax):
              export tap0=/tmp/vde.ctl
              export tap1=/tmp/myvde.ctl
              export ppc=/tmp/ppc.ctl
       (csh, tcsh 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
       interface 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, tcsh, 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
       environment 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
       Technologies").

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)