VDETAPLIB(1)						      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/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 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, 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 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)