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Tap/Tun for Debian etch

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Tap/Tun for Debian etch




In computer networking, TUN and TAP are virtual network kernel drivers. They implement network devices that are supported entirely in software, which is different from ordinary network devices that are backed up by hardware network adapters.

TAP (as in network tap) simulates an Ethernet device and it operates with layer 2 packets such as Ethernet frames. TUN (as in network TUNnel) simulates a network layer device and it operates with layer 3 packets such as IP packets. TAP is used to create a network bridge, while TUN is used with routing.

Packets sent by an operating system via a TUN/TAP device are delivered to a user-space program that attaches itself to the device. A user-space program may also pass packets into a TUN/TAP device. In this case TUN/TAP device delivers (or "injects") these packets to the operating system network stack thus emulating their reception from an external source.

~# apt-get install uml-utilities bridge-utils
uml-utilities提供tunctl,用来生成tun接口(三层)
bridge_utils提供brctl,用来生成tap接口(二层)

tunctl语法
~# tunctl /?
Create: tunctl [-b] [-u owner] [-t device-name] [-f tun-clone-device]
Delete: tunctl -d device-name [-f tun-clone-device]

The default tun clone device is /dev/net/tun - some systems use
/dev/misc/net/tun instead

-b will result in brief output (just the device name)

brctl的语法
~# brctl --help
Usage: brctl [commands]
commands:
addbr <bridge> add bridge
delbr <bridge> delete bridge
addif <bridge> <device> add interface to bridge
delif <bridge> <device> delete interface from bridge
setageing <bridge> <time> set ageing time
setbridgeprio <bridge> <prio> set bridge priority
setfd <bridge> <time> set bridge forward delay
sethello <bridge> <time> set hello time
setmaxage <bridge> <time> set max message age
setpathcost <bridge> <port> <cost> set path cost
setportprio <bridge> <port> <prio> set port priority
show show a list of bridges
showmacs <bridge> show a list of mac addrs
showstp <bridge> show bridge stp info
stp <bridge> {on|off} turn stp on/off
创建一个虚拟接口green
更改/etc/network/interfaces
~#vi /etc/network/interfaces
auto br0
iface br0 inet static
bridge_ports eth0
address 192.168.1.3
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 61.177.7.1
~#/etc/init.d/networking restart
~# tunctl -u wxt -t green -f /dev/net/tun
Set 'green' persistent and owned by uid 1000
~# brctl addif br0 green
~# ifconfig green 192.168.1.6 netmask 255.255.255.0 broadcast 192.168.1.255 up
~# ifconfig green
green Link encap:Ethernet HWaddr 00:FF:BD:35:60:03
inet addr:192.168.1.6 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::2ff:bdff:fe35:6003/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:44385 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) 

Tags:Tap Tun Debian etch
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