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
br08000.000000000000no
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
br08000.00e04c0e681a no eth0
ca0gu0@ub:~$ sudo ifconfig br0192.168.20.2up #开启虚拟接口
ca0gu0@ub:~$ipaddr1: lo: <LOOPBACK,UP,LOWER_UP> mtu65536qdisc noqueue state UNKNOWN groupdefaultlink/loopback00:00:00:00:00:00
brd00:00:00:00:00:00inet127.0.0.1/8scope host lo
valid_lft foreverPReferred_lft forever
inet6 ::1/128scope host
valid_lft forever preferred_lft forever2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu1500qdisc pfifo_fast master br0 state DOWN groupdefaultqlen1000link/ether00:e0:4c:0e:68:1a brd ff:ff:ff:ff:ff:ff3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu1500qdisc mq state UP groupdefaultqlen1000link/ether c8:e7:d8:fd:9c:78
brd ff:ff:ff:ff:ff:ff
inet192.168.90.102/24
brd192.168.90.255scopeglobalwlan0
valid_lft forever preferred_lft forever
inet6 fe80::cae7:d8ff:fefd:9c78/64scope link
valid_lft forever preferred_lft forever4: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu1500qdisc noqueue state DOWN groupdefaultlink/ether00:e0:4c:0e:68:1a brd ff:ff:ff:ff:ff:ff
inet192.168.20.2/24
brd192.168.20.255scopeglobal
br0
valid_lft forever preferred_lft fore
ca0gu0@ub:~$ sudo apt-getinstall 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
subnet192.168.20.0netmask255.255.255.0{
range192.168.20.100192.168.20.200;
option broadcast-address192.168.2.255;default-lease-time600;
max-lease-time7200;
}
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