--- sys/conf/options
+++ sys/conf/options
@@ -494,6 +494,8 @@
 #
 #
 #
+# For interconnect beetween kernels in claster
+MYLOOP_MASKLEN		opt_myloop_masklen.h
 
 # Netgraph(4). Use option NETGRAPH to enable the base netgraph code.
 # Each netgraph node type can be either be compiled into the kernel
--- sys/netinet/in.c
+++ sys/netinet/in.c
@@ -36,6 +36,7 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_mpath.h"
+#include "opt_myloop_masklen.h"
 
 #include <sys/param.h>
 #include <sys/eventhandler.h>
--- sys/netinet/in.h
+++ sys/netinet/in.h
@@ -372,8 +372,13 @@
 #define	IN_EXPERIMENTAL(i)	(((in_addr_t)(i) & 0xf0000000) == 0xf0000000)
 #define	IN_BADCLASS(i)		(((in_addr_t)(i) & 0xf0000000) == 0xf0000000)
 
+#ifndef MYLOOP_MASKLEN
+# define MYLOOP_MASKLEN 8
+#endif
+
+#define	INADDR_LOOPBACK		(in_addr_t)0x7f000001
 #define IN_LINKLOCAL(i)		(((in_addr_t)(i) & 0xffff0000) == 0xa9fe0000)
-#define IN_LOOPBACK(i)		(((in_addr_t)(i) & 0xff000000) == 0x7f000000)
+#define IN_LOOPBACK(i)		((((in_addr_t)(i) ^ INADDR_LOOPBACK) & (INADDR_BROADCAST << (32 - MYLOOP_MASKLEN))) == 0)
 #define IN_ZERONET(i)		(((in_addr_t)(i) & 0xff000000) == 0)
 
 #define	IN_PRIVATE(i)	((((in_addr_t)(i) & 0xff000000) == 0x0a000000) || \
@@ -384,7 +389,6 @@
  
 #define	IN_ANY_LOCAL(i)		(IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
 
-#define	INADDR_LOOPBACK		((in_addr_t)0x7f000001)
 #ifndef _KERNEL
 #define	INADDR_NONE		((in_addr_t)0xffffffff)	/* -1 return */
 #endif
--- sys/netinet/ip_input.c
+++ sys/netinet/ip_input.c
@@ -38,6 +38,7 @@
 #include "opt_ipstealth.h"
 #include "opt_ipsec.h"
 #include "opt_route.h"
+#include "opt_myloop_masklen.h"
 #include "opt_rss.h"
 
 #include <sys/param.h>
--- sys/netinet/ip_output.c
+++ sys/netinet/ip_output.c
@@ -40,6 +40,7 @@
 #include "opt_mbuf_stress_test.h"
 #include "opt_mpath.h"
 #include "opt_route.h"
+#include "opt_myloop_masklen.h"
 #include "opt_sctp.h"
 #include "opt_rss.h"
 
--- sys/netinet/myloop_masklen.h
+++ sys/netinet/myloop_masklen.h
@@ -0,0 +1,7 @@
+#include "opt_myloop_masklen.h"
+
+#ifndef MYLOOP_MASKLEN
+#define	IN_MY_LOOP(i)		(((in_addr_t)(i) & IN_CLASSA_NET) == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
+#else
+#define	IN_MY_LOOP(i)		(((in_addr_t)(i) & (INADDR_BROADCAST << (32 - MYLOOP_MASKLEN))) == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
+#endif