UDP how to recvfrom different ports at server side with binded port

Question

I have a problem on UDP socket port bind on receiving message from different client ports. I am compiling a C++ utility to check (20K) ports of a Linux server. I create client threads to send different ports of server by pthread_create. At server side, I have to bind socket to certain port, so it can only recvfrom (select like blocked IO)only 1 port. Can you give me some suggestions on UDP server to receive message from different ports?

Answer 1

只是不要在recvfrom（）中指定源地址，然后它将从所有远程地址和端口接收。

Answer 2

If you want to receive packets on multiple ports, you must open multiple sockets and use something like select() to multiplex the I/O. The Berkeley sockets API does not allow a socket to bind() to more than one address.