Android5.1双网卡NAT功能的iptables规则
在Android5.1上面，我们参照了系统里的WiFi热点、USB Tether、Bluetooth Tether功能，发现有一组命令可实现双网卡的NAT网络地址转发功能： echo 0 > /proc/sys/net/ipv4/ip_forward /system/bin/iptables -t nat -A natctrl_nat_POSTROUTING -o eth0 -j MASQUERADE /system/bin/iptables -A natctrl_FORWARD -i eth0 -o ap0 -m state --state ESTABLISHED,RELATED -g natctrl_tether_counters /system/bin/iptables -A natctrl_FORWARD -i ap0 -o eth0 -m state --state INVALID -j DROP /system/bin/iptables -A natctrl_FORWARD -i ap0 -o eth0 -g natctrl_tether_counters /system/bin/iptables -A natctrl_tether_counters -i ap0 -o eth0 -j RETURN /system/bin/iptables -A natctrl_tether_counters -i eth0 -o ap0 -j RETURN /system/bin/iptables -D natctrl_FORWARD -j DROP /system/bin/iptables -A natctrl_FORWARD -j D...