cannot connect to pppoe socket

Hi all,

There is a test demo code for making a 'pppoe socket' and connect it. In my machine it cannot connect well but some others not.

code below(some headers are useless here):
#include <linux/types.h>
#include <syslog.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <linux/if.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
#include <linux/ppp_defs.h>
#include <linux/in.h>
#include <linux/if_pppox.h>
int main(void)

{
	struct sockaddr_pppox sp;
	int sock;
	/* Make the session socket */
	sock = socket(AF_PPPOX, SOCK_STREAM, PX_PROTO_OE);

	sp.sa_family = AF_PPPOX;
	sp.sa_protocol = PX_PROTO_OE;
	sp.sa_addr.pppoe.sid = 1;
	memcpy(sp.sa_addr.pppoe.dev, "eth1", 16);
	memcpy(sp.sa_addr.pppoe.remote, "\x00\x00\x00\x00\x00\x00", 6);

	if (sock > 0)
		printf("socket succ\n");
	else
		return -1;

	if (connect(sock, (struct sockaddr *) &sp,
				sizeof(struct sockaddr_pppox)) < 0) {
		printf("connect err\n");
		return -1;
	}

	printf("connect succ\n");
	return 0;

}
<<<<<<<
Any info? I want to get 'pppoe socket' depend which environment.

Reg

--
c.j