diff -u pptpd-orig/pptpgre.c pptpd-1.3.3/pptpgre.c
--- pptpd-orig/pptpgre.c	2006-03-27 16:39:05.000000000 -0500
+++ pptpd-1.3.3/pptpgre.c	2007-04-13 23:23:33.000000000 -0400
@@ -342,7 +342,7 @@
 	struct pptp_gre_header *header;
 	int status, ip_len = 0;
 
-	dequeue_gre(cb, fd);
+	dequeue_gre(cb, cl);
 	if ((status = read(fd, buffer, sizeof(buffer))) <= 0) {
 		syslog(LOG_ERR, "GRE: read(fd=%d,buffer=%lx,len=%d) from network failed: status = %d error = %s",
 		       fd, (unsigned long) buffer, sizeof(buffer), status, status ? strerror(errno) : "No error");
@@ -404,7 +404,7 @@
 			return 0;
 		}
 		/* check for out-of-order sequence number */
-		if (seq_greater(seq, gre.seq_recv)) {
+		if (seq == gre.seq_recv + 1) {
 			if (pptpctrl_debug)
 				syslog(LOG_DEBUG, "GRE: accepting packet #%d", 
 				       seq);