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sudo brctl addbr br0
sudo ifconfig eth0 0.0.0.0 up
sudo ifconfig wlan0 0.0.0.0 up
sudo brctl addif br0 eth0
sudo brctl addif br0 wlan0
sudo ifconfig br0 10.1.21.8 netmask 255.255.255.0 #10.1.21.8是eth0的IP
sudo route add default gw 10.1.21.1