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VDETAPLIB(1)           DragonFly General Commands Manual          VDETAPLIB(1)


vdetaplib - Virtual Distributed Ethernet tap emulation library


No synopsis


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.


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").


vde_switch(1), vdeq(1).


VDE is a project by Renzo Davoli <renzo@cs.unibo.it> Virtual Distributed Ethernet December 6, 2006 VDETAPLIB(1)

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