我在同一局域网内分别用两台主机收发受限广播（255.255.255.255），两台主机在同一个网段的时候可以收到广播数据包，不在同一网段的时候收不到。我是Linux环境，用tcpdump指令可以抓到包。可是接收端就是收不到为什么啊？不知道是我的代码有问题还是网络的问题，网上的资料都说受限广播只要同一个局域网就算不同网段都能收到的，好心塞啊！下面是我的代码，求大神指点。
#include
#include
#include
#include 
#include 
#include 

#include"UDPMulticast.h"
#include"CommunicationProtocol.h"

#define UDP_BROADCAST_SEND_PORT 6666
#define UDP_BROADCAST_RECEIVE_PORT 7777
#define UDP_BROADCAST_ADDRESS "255.255.255.255"
#define MAX_UDP_BUFF 512

int g_BroadcastSockfd,g_BroadcastSocketfd;
struct sockaddr_in g_LocalAddress,g_BroadcastAddress;

void receive_of_UDP_broadcast_sockfd()
{
    int ret;

    g_BroadcastSockfd=socket(AF_INET,SOCK_DGRAM,0);
    if(g_BroadcastSockfdflag==0x1c1c)
        {
        printf("The flag in the packge is %cn",UDPBroadcastPackgt->flag);
        }
        else
        {
            perror("UDP broadcast  receive information error!n");
            exit(1);
        }
    }
}

/**********************************************************************/

void send_of_UDP_broadcast_sockfd()
{
    int flag,ret=1;
    struct sockaddr_in LocalAddress;

    memset(&g_BroadcastAddress,0,sizeof(g_BroadcastAddress));
    g_BroadcastAddress.sin_family=AF_INET;
    g_BroadcastAddress.sin_port=htons(UDP_BROADCAST_RECEIVE_PORT);
    g_BroadcastAddress.sin_addr.s_addr=inet_addr(UDP_BROADCAST_ADDRESS);
    bzero(&(g_BroadcastAddress.sin_zero),8);
    printf("Broadcast IP is %sn",inet_ntoa(g_BroadcastAddress.sin_addr));//*
    printf("Broadcast destination port is %dn",ntohs(g_BroadcastAddress.sin_port));


    memset(&LocalAddress,0,sizeof(LocalAddress));    //*
    LocalAddress.sin_family=AF_INET;
    LocalAddress.sin_port=htons(UDP_BROADCAST_SEND_PORT);
    LocalAddress.sin_addr.s_addr=htonl(INADDR_ANY);
    bzero(&(LocalAddress.sin_zero),8);

    g_BroadcastSocketfd=socket(AF_INET,SOCK_DGRAM,0);
    if(g_BroadcastSocketfdpacketsize=MAX_UDP_BUFF-8;

    UDPBrocastPackgt->flag='1';

    int PackgeSize;
    PackgeSize=sendto(g_BroadcastSocketfd,BuffOfSend,MAX_UDP_BUFF,0,(struct sockaddr *)&g_BroadcastAddress,sizeof(struct sockaddr_in));
    printf("PackgeSize=%dnBuff of UDP send=%dn",PackgeSize,sizeof(BuffOfSend));
    if(PackgeSize