Apply MLPPP patch from Muhammad Tayseer Alquoatli, very belatedly, with

thanks.  Changes:
- Handle session shutdown gracefully regarding leaving the bundle (bug that is
  caused when a all session leaves a bundle then another join)
- IP assignment is done only for the first session in the bundle (save IP
  waste for multiple MLPPP sessions)
- Route is being added only for the first session in the bundle (less routes
  on l2tpns system)
- Fix route deletion problem for MLPPP sessions (bug that caused when a
  session leaves a bundle)
- Uniformity of sequence number space satisfied (according to RFC1990)
- Fix reassembling fragmented packets and handling lost fragments (according
  to RFC 1990)
- FragmentatConnection to l2tpns.cvs.sourceforge.net closed by remote host.n
  across N session rather than two)
- Sequence numbers extraction mask has been corrected (bug in extracting
  sequence numbers)
- some clustering support fixes
- Upload/Download statistics has been corrected
- add "kill_timedout_sessions" config option

cluster.c

@@ -1,6 +1,6 @@
 // L2TPNS Clustering Stuff
 
-char const *cvs_id_cluster = "$Id: cluster.c,v 1.54 2006-12-04 20:50:02 bodea Exp $";
+char const *cvs_id_cluster = "$Id: cluster.c,v 1.55 2009-12-08 14:49:28 bodea Exp $";
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -402,7 +402,7 @@ void cluster_send_ping(time_t basetime)
 
 	x.ver = 1;
 	x.addr = config->bind_address;
-	x.undef = config->cluster_undefined_sessions + config->cluster_undefined_tunnels;
+	x.undef = config->cluster_undefined_sessions + config->cluster_undefined_tunnels + config->cluster_undefined_bundles;
 	x.basetime = basetime;
 
 	add_type(&p, C_PING, basetime, (uint8_t *) &x, sizeof(x));
@@ -940,9 +940,8 @@ void cluster_heartbeat()
 		if (bcount >= config->cluster_highest_bundleid)
 			break;
 
-		hb_add_type(&p, C_CTUNNEL, walk_bundle_number);
-		walk_tunnel_number = (1+walk_bundle_number)%(config->cluster_highest_bundleid+1);       // +1 avoids divide by zero.
-
+		hb_add_type(&p, C_CBUNDLE, walk_bundle_number);
+		walk_bundle_number = (1+walk_bundle_number)%(config->cluster_highest_bundleid+1);	// +1 avoids divide by zero.
 		++bcount;
         }