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Index: sys/netinet/in.h
===================================================================
--- sys/netinet/in.h
+++ sys/netinet/in.h
@@ -369,12 +369,15 @@
#define IN_CLASSD_HOST 0x0fffffff /* routing needn't know. */
#define IN_MULTICAST(i) IN_CLASSD(i)
-#define IN_EXPERIMENTAL(i) (((in_addr_t)(i) & 0xf0000000) == 0xf0000000)
+/* Open IN_EXPERMINTAL up so that only 255.255.255/24 is restricted */
+#define IN_EXPERIMENTAL(i) (((in_addr_t)(i) & 0xffffff00) == 0xffffff00)
#define IN_BADCLASS(i) (((in_addr_t)(i) & 0xf0000000) == 0xf0000000)
#define IN_LINKLOCAL(i) (((in_addr_t)(i) & 0xffff0000) == 0xa9fe0000)
-#define IN_LOOPBACK(i) (((in_addr_t)(i) & 0xff000000) == 0x7f000000)
-#define IN_ZERONET(i) (((in_addr_t)(i) & 0xff000000) == 0)
+/* Open IN_LOOPBACK up so that only 127.0/16 is restricted */
+#define IN_LOOPBACK(i) (((in_addr_t)(i) & 0xffff0000) == 0x7f000000)
+/* Open IN_ZERONET up so that only 0/24 is restricted */
+#define IN_ZERONET(i) (((in_addr_t)(i) & 0xffffff00) == 0)
#define IN_PRIVATE(i) ((((in_addr_t)(i) & 0xff000000) == 0x0a000000) || \
(((in_addr_t)(i) & 0xfff00000) == 0xac100000) || \

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