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/aarch64-linux-gnu/vde2/libvdetap.so
(csh, tchs syntax):
    setenv LD_PRELOAD /usr/lib/aarch64-linux-gnu/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>