p2p nat穿透不通，nat类型为端口限制锥形

21克的重量 2018-07-17 11:00:11

openwrt路由器想做nat穿透，在路由器上启动stun客户端连接公用stun服务器测试，nat类型为端口限制锥形，但是一直不通。然后自己搭了个stun服务器，发现路由器上同一个端口发出来的数据在两个服务器上接收到的外网ip和端口确实是一致的。但是自己简单写了一个测试程序（就是直接打开一个socket然后用同一个udp套接字往两个服务器发送数据）结果在两个服务器上接收到的数据外网端口不一致。求大神解答！！！！！！

 #include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <string.h>

#include <sys/socket.h>





int openPort( unsigned short port, unsigned int interfaceIp)

{

   int fd;

    

   fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);

      

   struct sockaddr_in addr;

   memset((char*) &(addr),0, sizeof(struct sockaddr_in));

   addr.sin_family = AF_INET;

   addr.sin_addr.s_addr = htonl(INADDR_ANY);

   addr.sin_port = htons(port);

   printf("addr.sin_addr.s_addr is %d,addr.sin_port is %d \n",addr.sin_addr.s_addr,addr.sin_port);

    

   if ( (interfaceIp != 0) && 

        ( interfaceIp != 0x100007f ) )

   {

      addr.sin_addr.s_addr = htonl(interfaceIp);    

   }

	

   bind( fd,(struct sockaddr*)&addr, sizeof(struct sockaddr_in));

      	

   return fd;



}







int sendMessage( int fd, char* buf, int l, 

             unsigned int dstIp, unsigned short dstPort)

{

  

   int s;

  

      printf("dstip is %d,dstport is %d\nbuf is %s\n",dstIp,dstPort,buf); 

      struct sockaddr_in to;

      int toLen = sizeof(struct sockaddr_in);

      memset(&to,0,toLen);

        

      to.sin_family = AF_INET;

      to.sin_port = htons(dstPort);

      to.sin_addr.s_addr = dstIp;

        

      s = sendto(fd, buf, l, 0,(struct sockaddr*)&to, toLen);



     

   return 0;

}







int main()

{

	int sockfd = -1;

	sockfd = openPort(20000,0);

	printf("fd is %d\n",sockfd);

	char *buf1 = "i am first!";

	sendMessage(sockfd,buf1,strlen(buf1),inet_addr("0.0.0.0"),18888);

	usleep(10*1000);

	sendMessage(sockfd,buf1,strlen(buf1),inet_addr("0.0.0.0"),20000);

	return 0;

}