openwrt nat失败排查

之前使用openwrt开启nat，就是在防火墙的端口转发中添加了samba服务的端口转发规则，结果发现不行，后来发现需要添加如下的自定义规则才行。

​​iptables -t nat -I PREROUTING -i eth0.2-p tcp -dport 135 -j DNAT --to-destination 192.168.120.1:135 ​​

​​iptables -t nat -I PREROUTING -i eth0.2-p tcp -dport 136 -j DNAT --to-destination 192.168.120.1:136 ​​

​​iptables -t nat -I PREROUTING -i eth0.2-p tcp -dport 137 -j DNAT --to-destination 192.168.120.1:137 ​​

​​iptables -t nat -I PREROUTING -i eth0.2-p tcp -dport 138 -j DNAT --to-destination 192.168.120.1:138 ​​

​​iptables -t nat -I PREROUTING -i eth0.2-p tcp -dport 139 -j DNAT --to-destination 192.168.120.1:139 ​​

​​iptables -t nat -I PREROUTING -i eth0.2-p tcp -dport 445 -j DNAT --to-destination 192.168.120.1:445​​