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>