启动共享：
#!/bin/sh
natd -interface tun0
ipfw -f flush
ipfw add divert natd ip from any to any via tun0
ipfw add pass all from any to any
sysctl -w net.inet.ip.forwarding=1
关闭共享：
#!/bin/sh
killall natd
ipfw -f flush
sysctl -w net.inet.ip.forwarding=0
#!/bin/sh
natd -interface tun0
ipfw -f flush
ipfw add divert natd ip from any to any via tun0
ipfw add pass all from any to any
sysctl -w net.inet.ip.forwarding=1
关闭共享：
#!/bin/sh
killall natd
ipfw -f flush
sysctl -w net.inet.ip.forwarding=0
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