diff --git a/src/proxymain.c b/src/proxymain.c
index 2dbc5af..ea434f9 100644
--- a/src/proxymain.c
+++ b/src/proxymain.c
@@ -346,6 +346,9 @@ int MODULEMAINFUNC (int argc, char** argv){
 #endif
 			}
 			break;
+		 case 'N':
+			getip46(46, (unsigned char *)argv[i]+2, (struct sockaddr *)&srv.extNat);
+			break;
 		 case 'p':
 			*SAPORT(&srv.intsa) = htons(atoi(argv[i]+2));
 			break;
diff --git a/src/socks.c b/src/socks.c
index cb71e0e..97f58d4 100644
--- a/src/socks.c
+++ b/src/socks.c
@@ -173,9 +173,9 @@ void * sockschild(struct clientparam* param) {
 	case 3:
 
 #ifndef NOIPV6	 
-	 param->sinsl = *SAFAMILY(&param->req)==AF_INET6? param->srv->extsa6 : param->srv->extsa;
+	 param->sinsl = *SAFAMILY(&param->req)==AF_INET6? param->srv->extsa6 : (SAISNULL(&param->srv->extNat)?param->srv->extsa:param->srv->extNat);
 #else
-	 param->sinsl = param->srv->extsa;
+	 param->sinsl = SAISNULL(&param->srv->extNat)?param->srv->extsa:param->srv->extNat;
 #endif
 	 if ((param->remsock=so._socket(SASOCK(&param->req), command == 2? SOCK_STREAM:SOCK_DGRAM, command == 2?IPPROTO_TCP:IPPROTO_UDP)) == INVALID_SOCKET) {RETURN (11);}
 	 param->operation = command == 2?BIND:UDPASSOC;
@@ -461,7 +461,7 @@ struct proxydef childdef = {
 	1080,
 	0,
 	S_SOCKS,
-	""
+	"-N(EXTERNAL_IP) External NAT address to report to client for BIND\n"
 };
 #include "proxymain.c"
 #endif
diff --git a/src/structures.h b/src/structures.h
index 08a14b7..4df9e07 100644
--- a/src/structures.h
+++ b/src/structures.h
@@ -445,9 +445,11 @@ struct srvparam {
 	struct sockaddr_in6 intsa;
 	struct sockaddr_in6 extsa6;
 	struct sockaddr_in6 extsa;
+	struct sockaddr_in6 extNat;
 #else
 	struct sockaddr_in intsa;
 	struct sockaddr_in extsa;
+	struct sockaddr_in extNat;
 #endif
 	pthread_mutex_t counter_mutex;
 	struct pollfd fds;