I use Tomato Pandora version and ZTE H618B(16M flash & 64M RAM). Enable the USB to connect the 3G wireless card. I run some application in the RAM. The application need to access the Internet through the USB 3G network. Now I need to monitor the status of the application. Currently I use the net cable between Main router and this H618B. So that I can login H618B. But now I hope that I can control H618B by the wireless. That is to say, H618B act as a wireless client of the main router. I tested and found that when H618B's wireless is configured as wireless client: If WAN is configured as DHCP or static. H618B can get an IP address from main router and accessible. If WAN is configured as 3G, from the main router, I can see a valid IP address has been assigned to H618B, but I couldn't access H618B by its IP address. Why?