Problem with sockets an 2.6.21-rc5 kernel

[Jose Alberto Reguero]

I had two python programs, server.py and client.py(attached)

With server.py in  a kernel 2.6.21-rc5 x86_64 and client.py in the same 
machine,  server.py get the message.

With server.py in  a kerner 2.6.21-rc5 x86_64 and client.py in another 
machine, server.py don't get the message.

The same with the programs in c(attached).

With kernel 2.6.20.3 the programs work well.

There are something wrong in the programs?

Thanks.

Jose Alberto

client.py
Description: application/python

#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>

main()
{
	int sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	struct sockaddr_in ClientAddr;
	memset(&ClientAddr, 0, sizeof(ClientAddr));
	ClientAddr.sin_family = AF_INET;
	ClientAddr.sin_addr.s_addr = inet_addr("227.234.253.9");
	int port = 15922;
	ClientAddr.sin_port = htons((short) port);
	char str[] = "Hello, world";
	sendto(sock, str, strlen(str), 0, (struct sockaddr *)&ClientAddr, sizeof(ClientAddr));
	close(sock);
}

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>

main()
{
        struct sockaddr_in ServerAddr;
        int sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        int reuse = 1;
        setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(int));
        memset(&ServerAddr, 0, sizeof(ServerAddr));
        ServerAddr.sin_family = AF_INET;
        ServerAddr.sin_addr.s_addr = htonl(INADDR_ANY);
        int port = 15922;
        ServerAddr.sin_port = htons((short) port);
        bind(sock, (struct sockaddr *)&ServerAddr, sizeof(ServerAddr));
        struct ip_mreq mreq;
	memset(&mreq, 0, sizeof(mreq));
        mreq.imr_multiaddr.s_addr = inet_addr("227.234.253.9");
	mreq.imr_interface.s_addr = htonl(INADDR_ANY);
        setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
        char str[100];
	memset(&str, 0, sizeof(str));
        recv(sock, str, 100, 0);
        printf(":%s:\n", str);
	close (sock);
}

server.py
Description: application/python