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Universal TUN/TAP device driver.
Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
Linux, Solaris drivers
Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
FreeBSD TAP driver
Copyright (c) 1999-2000 Maksim Yevmenkin <m_evmenkin@yahoo.com>
1. Description
TUN/TAP provides packet reception and transmission for user space programs.
It can be viewed as a simple Point-to-Point or Ethernet device, which
instead of receiving packets from a physical media, receives them from
user space program and instead of sending packets via physical media
writes them to the user space program.
When a program opens /dev/tunX or /dev/tapX, driver creates and
registers corresponding net device tunX or tapX. After a program closed
above devices, driver will automatically delete tunXX or tapXX device
and all routes corresponding to it.
This package(http://vtun.sourceforge.net/tun) contains two simple example
programs how to use tun and tap devices. Both programs work like
bridge between two network interfaces.
br_select.c - bridge based on select system call.
br_sigio.c - bridge based on async io and SIGIO signal.
However the best example is VTun http://vtun.sourceforge.net :))
2. Installation
Run './configure' to configure the driver.
Run 'make install' to compile and install driver module and to create
proper device nodes.
3. Loading driver module
Linux
To load TUN/TAP driver module run:
modprobe tun
To configure automatic loading of the 'tun' module you have to modify
/etc/modules.conf
Add following line if you have 2.2.x kernel:
alias char-major-90 tun
Add following line if you have 2.4.x kernel:
alias char-major-10-200 tun
Run:
modprobe -a
TUN/TAP driver will be automatically loaded when application access
/dev/tunX, /dev/tapX or /dev/net/tun.
If "Kernel module loader" - module auto-loading support is not enabled
in your kernel then you can add
modprobe tun
to one of the startup rc files.
Solaris
Everything is done automatically under Solaris.
FreeBSD
To load TAP driver module run:
kldload if_tap
Add:
kldload if_tap
to one of the startup rc files.
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