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 interface.
       (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>