rtl8198d+8812F+8192F 支持nattype设置固件
/proc/conenat
This proc is used to select the nat type :
1. echo 0 > /proc/conenat, it is symmetric nat;
2. echo 1 > /proc/conenat, it is full cone nat;
3. echo 2 > /proc/conenat, it is restricted cone nat;
4. echo 3 > /proc/conenat, it is port restricted cone nat.