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发表于 2003-5-20 11:02:28
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Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters.
You may find more information in syslog or the output from dmesg
按下面的办法来试一下。
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>
Revision of this document 2002 by Florian Thiel <florian.thiel@gmx.net>
1. Description
TUN/TAP provides packet reception and transmission for user space programs.
It can be seen as a simple Point-to-Point or Ethernet device, which,
instead of receiving packets from physical media, receives them from
user space program and instead of sending packets via physical media
writes them to the user space program.
In order to use the driver a program has to open /dev/net/tun and issue a
corresponding ioctl() to register a network device with the kernel. A network
device will appear as tunXX or tapXX, depending on the options chosen. When
the program closes the file descriptor, the network device and all
corresponding routes will disappear.
Depending on the type of device chosen the userspace program has to read/write
IP packets (with tun) or ethernet frames (with tap). Which one is being used
depends on the flags given with the ioctl().
The package from http://vtun.sourceforge.net/tun contains two simple examples
for how to use tun and tap devices. Both programs work like a 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. Configuration
Create device node:
mkdir /dev/net (if it doesn't exist already)
mknod /dev/net/tun c 10 200
Set permissions:
e.g. chmod 0700 /dev/net/tun
if you want the device only accesible by root. Giving regular users the
right to assign network devices is NOT a good idea. Users could assign
bogus network interfaces to trick firewalls or administrators.
Driver module autoloading
Make sure that "Kernel module loader" - module auto-loading support is enabled
in your kernel.
Add the following line to the /etc/modules.conf:
alias char-major-10-200 tun
and run
depmod -a
Manual loading
insert the module by hand:
modprobe tun
If you do it the latter way, you have to load the module every time you
need it, if you do it the other way it will be automatically loaded when
/dev/net/tun is being opened. |
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