socket connect 错误-红联Linux系统门户

刚接触socket，找了个简单的程序学习，但编译通过了，在执行服务器后返回了server socket name，然后运行客户端时出现错误：client connet: no route to host
我查了connect的错误类型，说是ICMP错误:不可路由(soft error)(目的地不可达)
我是在一台机器上即作服务器又做客户端这个问题该如何解决呢。谢谢！！

///////server
#include
#include
#include
#include
#include
#include
#include
#include

#define MAX_BUF_SIZE 1024
static char buf[MAX_BUF_SIZE];

int display_address(const char *msg, struct sockaddr_in* p_sin)
{
if(p_sin->sin_family != AF_INET)
{
fprintf(stderr, "Not an Internet socket.\n");
return -1;
}
fprintf(stdout, "%s ==> address is: %s : %d\n", msg, inet_ntoa(p_sin->sin_addr), ntohs(p_sin->sin_port));
return 0;
}

int main()
{
int sock, serv;
struct sockaddr_in sin;
int size;
fd_set set;

FD_ZERO(&set);

serv = socket(AF_INET, SOCK_STREAM, 0);
if (serv == -1)
{
perror("server socket");
return -1;
}

memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons(1685);

if (bind(serv, (struct sockaddr *)&sin, sizeof(sin)) == -1)
{
perror("server bind");
return -1;
}

listen(serv, 5);

memset(&sin, 0, sizeof(sin));
size = sizeof(sin);
if (getsockname(serv, (struct sockaddr *)&sin, &size) == -1)
perror("serv sockname");
display_address("server socket name", &sin);
sock = accept(serv, NULL, NULL);

if (sock != -1)
{
memset(&sin, 0, sizeof(sin));
size = sizeof(sin);
if (getpeername(sock, (struct sockaddr *)&sin, &size) == -1)
perror("sock peername");
display_address("sock peer name", &sin);
memset(&sin, 0, sizeof(sin));
size = sizeof(sin);
if (getsockname(sock, (struct sockaddr *)&sin, &size))
perror("sock sockname");
display_address("sock socket name", &sin);

//sleep(1);
while(1)
{
FD_SET(sock, &set);
select(FD_SETSIZE, &set, NULL, NULL, NULL);
size = recv(sock, buf, MAX_BUF_SIZE, 0);
if (size <= 0)
break;
printf("server recv %d bytes\n", size);
}
}
//printf("server recv %d bytes\n", size);
close(serv);
close(sock);
}
////////client
#include
#include
#include
#include
#include
#include
#include

#define MAX_BUF_SIZE (300)
static char buf[MAX_BUF_SIZE] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

int main()
{
int sock;
struct sockaddr_in sin;
int size;

sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == -1)
{
perror("client socket");
return -1;
}

memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr("192.168.21.207");
sin.sin_port = htons(1685);

if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1)
{
perror("client connect");
return -1;
}
size = 0;
if (sock != -1)
{
size += send(sock, buf, MAX_BUF_SIZE, 0);
size += send(sock, buf, MAX_BUF_SIZE, 0);
size += send(sock, buf, MAX_BUF_SIZE, 0);
size += send(sock, buf, MAX_BUF_SIZE, 0);
size += send(sock, buf, MAX_BUF_SIZE, 0);
}
printf("client send %d bytes\n", size);
close(sock);
}

socket connect 错误

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