C (UDP) 中的套接字服务器不接收数据包。 怎么做？

Question

I've done a UDP socket server in C. The server works properly only if the packets are send to 127.0.0.1. I'm trying to test it with packet sender, and I want to open a socket at the address 192.168.231.54. Anyway, if I write this address in the code, I receive an error ("Cannot assign requested address"), and this error appears for each single address different from 127.0.0.1. I want to open a socket to 192.168.231.54 and I want to send packets to this address with Packet Sender.

Here is the server code:

//*********SOCKET OPENING**************
   
    int fd;
    struct sockaddr_in serveraddr, cliaddr;

    if ( (fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
        perror( "socket failed" );
        exit(EXIT_FAILURE);
    }
        
    memset( &serveraddr, 0, sizeof(serveraddr) );
    memset(&cliaddr, 0, sizeof(cliaddr));

    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(50037);
    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);  

    if ( bind(fd, (const struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0 ) {
        perror( "bind failed" );
        exit(EXIT_FAILURE);
    }
    else{
        perror("socket opened");
    }

    //Receiving data into hex_array array
    char hex_array[lenght];
    int len;
    len = sizeof(cliaddr);
    int n = recvfrom(fd, (uint8_t *)hex_array, lenght, NULL, ( struct sockaddr *) &cliaddr, &len);
    //Printing of the received data on the socket
    printf("START DEBUG:\n");
    printf("%s\n", hex_array);
    printf("END DEBUG.\n");

Answer 1

The address you bind the socket to has to actually be your computer's IP address. You can't just pick a random address.