Thx!
But it doesn't work.
When Server Start, it display "Server IP Address IP1:27015". I don't bind the IP, it select one IP such as IP1.
You can 'connect IP2:27015' Or 'connect IP3:27015' ,I can enter the Server with all IP1,IP2,IP3. But get_cvar_string("net_address" , szServerIP , 1

always return the IP: IP1, which the "DISPLAY IP" when the server start . it's IP1.
I want to get IP such as:
Client CMD 'connect IP2:27015' , it should return IP2
Client CMD 'connect IP3:27015' , it should return IP3
Client CMD 'connect IP1:27015' , it should return IP1
it seems no way can reach it