diff --git a/src/api/sockets.c b/src/api/sockets.c
index b7632489..786a294e 100644
--- a/src/api/sockets.c
+++ b/src/api/sockets.c
@@ -44,6 +44,8 @@
  *
  */
 
+//#include <errno.h>
+
 #include "lwip/opt.h"
 
 #if LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */
diff --git a/src/core/ipv6/nd6.c b/src/core/ipv6/nd6.c
index 0b367181..2a5b77d4 100644
--- a/src/core/ipv6/nd6.c
+++ b/src/core/ipv6/nd6.c
@@ -1361,8 +1361,13 @@ nd6_is_prefix_in_netif(const ip6_addr_t *ip6addr, struct netif *netif)
   }
   /* Check to see if address prefix matches a (manually?) configured address. */
   for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
-    if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
-        ip6_addr_netcmp(ip6addr, netif_ip6_addr(netif, i))) {
+    int prefix_match = 0;
+    if (ip6_addr_is_zt_6plane(ip6addr) || ip6_addr_is_zt_adhoc(ip6addr)) {
+      prefix_match = ip6_addr_6plane_cmp(ip6addr, netif_ip6_addr(netif, i));
+    } else {
+      prefix_match = ip6_addr_netcmp(ip6addr, netif_ip6_addr(netif, i));
+    }
+    if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) && prefix_match) {
       return 1;
     }
   }
diff --git a/src/include/lwip/errno.h b/src/include/lwip/errno.h
index 641cffb0..cec43f7f 100644
--- a/src/include/lwip/errno.h
+++ b/src/include/lwip/errno.h
@@ -174,7 +174,11 @@ extern "C" {
 #define  EMEDIUMTYPE    124  /* Wrong medium type */
 
 #ifndef errno
-extern int errno;
+#if defined(__linux__) && !defined(__ANDROID__)
+	#include <errno.h>
+#else
+	extern int errno;
+#endif
 #endif
 
 #else /* LWIP_PROVIDE_ERRNO */
diff --git a/src/include/lwip/ip6_addr.h b/src/include/lwip/ip6_addr.h
index ee381aeb..b879f212 100644
--- a/src/include/lwip/ip6_addr.h
+++ b/src/include/lwip/ip6_addr.h
@@ -133,6 +133,14 @@ typedef struct ip6_addr ip6_addr_t;
 #define ip6_addr_netcmp(addr1, addr2) (((addr1)->addr[0] == (addr2)->addr[0]) && \
                                        ((addr1)->addr[1] == (addr2)->addr[1]))
 
+#define ip6_addr_is_zt_6plane(addr1) (((addr1)->addr[0] & PP_HTONL(0xffffffffUL)) == PP_HTONL(0xfc937e7fUL) && \
+                                        ((addr1)->addr[1] & PP_HTONL(0xff000000UL)) == PP_HTONL(0x72000000UL))
+
+#define ip6_addr_is_zt_adhoc(addr1) (((addr1)->addr[0] & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xfce90000UL))
+
+#define ip6_addr_6plane_cmp(addr1, addr2) (((addr1)->addr[0] == (addr2)->addr[0]) && \
+                                    ((addr1)->addr[1] & PP_HTONL(0xff000000UL)) == ((addr2)->addr[1] & PP_HTONL(0xff000000UL)))
+
 #define ip6_addr_cmp(addr1, addr2) (((addr1)->addr[0] == (addr2)->addr[0]) && \
                                     ((addr1)->addr[1] == (addr2)->addr[1]) && \
                                     ((addr1)->addr[2] == (addr2)->addr[2]) && \