Ubuntu无线转有线教程

本来想测试一下有线转无线的，奈何网卡不支持，所以就测试了一回无线转有线的测试！（真无聊，不过也算学习一下linux网桥的知识）

ca0gu0@ub:~$ sudo brctl addbr br0 #添加网桥
ca0gu0@ub:~$ brctl show #查看网桥
bridge name    bridge id    STP enabled    interfaces
br0    8000.000000000000    no

ca0gu0@ub:~$ sudo brctl addif br0 eth0 #将物理网卡做为虚拟网桥的端口
ca0gu0@ub:~$ sudo brctl delif br0 eth0 #删除网桥接中的物理网卡
ca0gu0@ub:~$ brctl show #查看
bridge name    bridge id    STP enabled    interfaces
br0    .00e04c0e681a    no    eth0

ca0gu0@ub:~$ sudo ifconfig br0 192.168.20.2 up #开启虚拟接口

ca0gu0@ub:~$ ip addr
: lo: <LOOPBACK,UP,LOWER_UP> mtu  qdisc noqueue state UNKNOWN group default
link/loopback ::::: brd :::::
inet 127.0.0.1/ scope host lo
valid_lft forever preferred_lft forever
inet6 ::/ scope host
valid_lft forever preferred_lft forever
: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu  qdisc pfifo_fast master br0 state DOWN group default qlen
link/ether :e0:4c:0e::1a brd ff:ff:ff:ff:ff:ff
: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc mq state UP group default qlen
link/ether c8:e7:d8:fd:9c: brd ff:ff:ff:ff:ff:ff
inet 192.168.90.102/ brd 192.168.90.255 scope global wlan0
valid_lft forever preferred_lft forever
inet6 fe80::cae7:d8ff:fefd:9c78/ scope link
valid_lft forever preferred_lft forever
: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu  qdisc noqueue state DOWN group default
link/ether :e0:4c:0e::1a brd ff:ff:ff:ff:ff:ff
inet 192.168.20.2/ brd 192.168.20.255 scope global br0
valid_lft forever preferred_lft fore

ca0gu0@ub:~$ sudo apt-get install isc-dhcp-server    # 安装dhcp服务
ca0gu0@ub:~$ sudo vi /etc/default/isc-dhcp-server
INTERFACES="br0"
ca0gu0@ub:~$ sudo cp /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.conf_bk

ca0gu0@ub:~$ sudo vi /etc/dhcp/dhcpd.conf
subnet 192.168.20.0 netmask 255.255.255.0 {
range 192.168.20.100 192.168.20.200;
option broadcast-address 192.168.2.255;
default-lease-time ;
max-lease-time ;
}

ca0gu0@ub:~$ sudo /etc/init.d/isc-dhcp-server start
* Starting ISC DHCP server dhcpd [ OK ]

ca0gu0@ub:~$ ifconfig br0 down #停止虚拟接口
ca0gu0@ub:~$ sudo brctl delbr br0    #删除虚拟接口

ca0gu0@ub:~$ ifconfig br0 down #停止虚拟接口
ca0gu0@ub:~$ sudo brctl delbr br0    #删除虚拟接口