diff --git a/miniupnpd/Changelog.txt b/miniupnpd/Changelog.txt
index 16f6b31..83841cc 100644
--- a/miniupnpd/Changelog.txt
+++ b/miniupnpd/Changelog.txt
@@ -1,4 +1,7 @@
-$Id: Changelog.txt,v 1.446 2019/04/09 20:04:32 nanard Exp $
+$Id: Changelog.txt,v 1.448 2019/05/21 08:39:42 nanard Exp $
+
+2019/05/21:
+  Allow to use two different network interfaces for IPv4 and IPv6 internet
 
 2019/05/02:
   Fix ssdp notify on unrelated interfaces
diff --git a/miniupnpd/INSTALL b/miniupnpd/INSTALL
index c79cd61..d22f6bc 100644
--- a/miniupnpd/INSTALL
+++ b/miniupnpd/INSTALL
@@ -152,6 +152,10 @@ UPNP requests forwarding is not implemented.
 It is however possible to use STUN. See the ext_perform_stun / ext_stun_host
  / ext_stun_port options.
 
+it is also possible to set a different interface for IPv6 WAN
+ext_ifname=eth0
+ext_ifname6=sit0
+
 miniupnpd supports some kind of security check for allowing or disallowing
 redirection to be made. The UPnP permission rules are read from the
 miniupnpd.conf configuration file.
diff --git a/miniupnpd/miniupnpd.c b/miniupnpd/miniupnpd.c
index b56c7d7..3f09e81 100644
--- a/miniupnpd/miniupnpd.c
+++ b/miniupnpd/miniupnpd.c
@@ -1,4 +1,4 @@
-/* $Id: miniupnpd.c,v 1.232 2018/07/06 12:35:26 nanard Exp $ */
+/* $Id: miniupnpd.c,v 1.235 2019/05/21 08:39:43 nanard Exp $ */
 /* vim: tabstop=4 shiftwidth=4 noexpandtab
  * MiniUPnP project
  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
@@ -1178,6 +1178,11 @@ init(int argc, char * * argv, struct runtime_vars * v)
 			case UPNPEXT_IFNAME:
 				ext_if_name = ary_options[i].value;
 				break;
+#ifdef ENABLE_IPV6
+			case UPNPEXT_IFNAME6:
+				ext_if_name6 = ary_options[i].value;
+				break;
+#endif
 			case UPNPEXT_IP:
 				use_ext_ip_addr = ary_options[i].value;
 				break;
@@ -1501,6 +1506,14 @@ init(int argc, char * * argv, struct runtime_vars * v)
 			else
 				fprintf(stderr, "Option -%c takes one argument.\n", argv[i][1]);
 			break;
+#ifdef ENABLE_IPV6
+		case 'I':
+			if(i+1 < argc)
+				ext_if_name6 = argv[++i];
+			else
+				fprintf(stderr, "Option -%c takes one argument.\n", argv[i][1]);
+			break;
+#endif
 #ifdef USE_PF
 		case 'q':
 			if(i+1 < argc)
@@ -1672,12 +1685,17 @@ init(int argc, char * * argv, struct runtime_vars * v)
 			fprintf(stderr, "Unknown option: %s\n", argv[i]);
 		}
 	}
-	if(!ext_if_name || !lan_addrs.lh_first)
-	{
+	if(!ext_if_name || !lan_addrs.lh_first) {
 		/* bad configuration */
 		goto print_usage;
 	}
 
+	/* IPv6 ifname is defaulted to same as IPv4 */
+#ifdef ENABLE_IPV6
+	if(!ext_if_name6)
+		ext_if_name6 = ext_if_name;
+#endif
+
 	if (use_ext_ip_addr && GETFLAG(PERFORMSTUNMASK)) {
 		fprintf(stderr, "Error: options ext_ip= and ext_perform_stun=yes cannot be specified together\n");
 		return 1;
@@ -1825,7 +1843,11 @@ print_usage:
 #ifndef DISABLE_CONFIG_FILE
 			"[-f config_file] "
 #endif
-			"[-i ext_ifname] [-o ext_ip]\n"
+			"[-i ext_ifname] "
+#ifdef ENABLE_IPV6
+			"[-I ext_ifname6] "
+#endif
+			"[-o ext_ip]\n"
 #ifndef MULTIPLE_EXTERNAL_IP
 			"\t\t[-a listening_ip]"
 #else
@@ -2011,6 +2033,11 @@ main(int argc, char * * argv)
 #endif
 	       GETFLAG(ENABLEUPNPMASK) ? "UPnP-IGD " : "",
 	       ext_if_name, upnp_bootid);
+#ifdef ENABLE_IPV6
+	if (ext_if_name6 != ext_if_name) {
+		syslog(LOG_INFO, "specific IPv6 ext if %s", ext_if_name6);
+	}
+#endif
 
 	if(GETFLAG(PERFORMSTUNMASK))
 	{
diff --git a/miniupnpd/miniupnpd.conf b/miniupnpd/miniupnpd.conf
index 12bb3c0..0e0a008 100644
--- a/miniupnpd/miniupnpd.conf
+++ b/miniupnpd/miniupnpd.conf
@@ -1,6 +1,9 @@
 # WAN network interface
 #ext_ifname=eth1
 #ext_ifname=xl1
+# if the WAN network interface for IPv6 is different than for IPv4,
+# set ext_ifname6
+#ext_ifname6=eth2
 # If the WAN interface has several IP addresses, you
 # can specify the one to use below
 #ext_ip=
diff --git a/miniupnpd/options.c b/miniupnpd/options.c
index 47c53b1..757250c 100644
--- a/miniupnpd/options.c
+++ b/miniupnpd/options.c
@@ -1,9 +1,9 @@
-/* $Id: options.c,v 1.36 2018/07/06 12:05:48 nanard Exp $ */
+/* $Id: options.c,v 1.37 2019/05/21 08:39:44 nanard Exp $ */
 /* vim: tabstop=4 shiftwidth=4 noexpandtab
  * MiniUPnP project
  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
  * author: Ryan Wagoner
- * (c) 2006-2018 Thomas Bernard
+ * (c) 2006-2019 Thomas Bernard
  * This software is subject to the conditions detailed
  * in the LICENCE file provided within the distribution */
 
@@ -30,6 +30,9 @@ static const struct {
 	const char * name;
 } optionids[] = {
 	{ UPNPEXT_IFNAME, "ext_ifname" },
+#ifdef ENABLE_IPV6
+	{ UPNPEXT_IFNAME6, "ext_ifname6" },
+#endif
 	{ UPNPEXT_IP,	"ext_ip" },
 	{ UPNPEXT_PERFORM_STUN, "ext_perform_stun" },
 	{ UPNPEXT_STUN_HOST, "ext_stun_host" },
diff --git a/miniupnpd/options.h b/miniupnpd/options.h
index a149756..f1e5294 100644
--- a/miniupnpd/options.h
+++ b/miniupnpd/options.h
@@ -1,9 +1,9 @@
-/* $Id: options.h,v 1.29 2018/07/06 12:05:48 nanard Exp $ */
+/* $Id: options.h,v 1.30 2019/05/21 08:39:44 nanard Exp $ */
 /* vim: tabstop=4 shiftwidth=4 noexpandtab
  * MiniUPnP project
  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
  * author: Ryan Wagoner
- * (c) 2006-2018 Thomas Bernard
+ * (c) 2006-2019 Thomas Bernard
  * This software is subject to the conditions detailed
  * in the LICENCE file provided within the distribution */
 
@@ -17,6 +17,9 @@
 enum upnpconfigoptions {
 	UPNP_INVALID = 0,
 	UPNPEXT_IFNAME = 1,		/* ext_ifname */
+#ifdef ENABLE_IPV6
+	UPNPEXT_IFNAME6,		/* ext_ifname6 */
+#endif
 	UPNPEXT_IP,				/* ext_ip */
 	UPNPEXT_PERFORM_STUN,		/* ext_perform_stun */
 	UPNPEXT_STUN_HOST,		/* ext_stun_host */
diff --git a/miniupnpd/pcpserver.c b/miniupnpd/pcpserver.c
index a964aa9..aee6e45 100644
--- a/miniupnpd/pcpserver.c
+++ b/miniupnpd/pcpserver.c
@@ -1,5 +1,6 @@
-/* $Id: pcpserver.c,v 1.47 2018/03/13 10:21:19 nanard Exp $ */
-/* MiniUPnP project
+/* $Id: pcpserver.c,v 1.51 2019/05/21 08:39:44 nanard Exp $ */
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
+ * MiniUPnP project
  * Website : http://miniupnp.free.fr/
  * Author : Peter Tatrai
 
@@ -590,6 +591,17 @@ static int CheckExternalAddress(pcp_info_t* pcp_msg_info)
 				pcp_msg_info->result_code = PCP_ERR_NETWORK_FAILURE;
 				return -1;
 			}
+#ifdef ENABLE_IPV6
+		} else if ((af == AF_INET6) && (ext_if_name6 != ext_if_name)) {
+			if(!ext_if_name6 || ext_if_name6[0]=='\0') {
+				pcp_msg_info->result_code = PCP_ERR_NETWORK_FAILURE;
+				return -1;
+			}
+			if(getifaddr_in6(ext_if_name6, af, &external_addr) < 0) {
+				pcp_msg_info->result_code = PCP_ERR_NETWORK_FAILURE;
+				return -1;
+			}
+#endif
 		} else {
 			if(!ext_if_name || ext_if_name[0]=='\0') {
 				pcp_msg_info->result_code = PCP_ERR_NETWORK_FAILURE;
@@ -686,6 +698,7 @@ static int CreatePCPPeer_NAT(pcp_info_t *pcp_msg_info)
 	char peerip_s[INET6_ADDRSTRLEN], extip_s[INET6_ADDRSTRLEN];
 	time_t timestamp = upnp_time() + pcp_msg_info->lifetime;
 	int r;
+	const char * ext_if = ext_if_name;
 
 	FillSA((struct sockaddr*)&intip, pcp_msg_info->mapped_ip,
 	       pcp_msg_info->int_port);
@@ -718,9 +731,14 @@ static int CreatePCPPeer_NAT(pcp_info_t *pcp_msg_info)
 		eport = pcp_msg_info->int_port;
 	}
 
+#ifdef ENABLE_IPV6
+	if (ret_extip.ss_family == AF_INET6) {
+		ext_if = ext_if_name6;
+	}
+#endif
 #ifdef PCP_FLOWP
 	if (pcp_msg_info->flowp_present && pcp_msg_info->dscp_up) {
-		if (add_peer_dscp_rule2(ext_if_name, peerip_s,
+		if (add_peer_dscp_rule2(ext_if, peerip_s,
 					pcp_msg_info->peer_port, pcp_msg_info->dscp_up,
 					pcp_msg_info->mapped_str, pcp_msg_info->int_port,
 					proto, pcp_msg_info->desc, timestamp) < 0 ) {
@@ -735,7 +753,7 @@ static int CreatePCPPeer_NAT(pcp_info_t *pcp_msg_info)
 	}
 
 	if (pcp_msg_info->flowp_present && pcp_msg_info->dscp_down) {
-		if (add_peer_dscp_rule2(ext_if_name,  pcp_msg_info->mapped_str,
+		if (add_peer_dscp_rule2(ext_if,  pcp_msg_info->mapped_str,
 					pcp_msg_info->int_port, pcp_msg_info->dscp_down,
 					peerip_s, pcp_msg_info->peer_port, proto, pcp_msg_info->desc, timestamp)
 		    < 0 ) {
@@ -751,7 +769,7 @@ static int CreatePCPPeer_NAT(pcp_info_t *pcp_msg_info)
 	}
 #endif
 
-	r = add_peer_redirect_rule2(ext_if_name,
+	r = add_peer_redirect_rule2(ext_if,
 				    peerip_s,
 				    pcp_msg_info->peer_port,
 				    extip_s,
diff --git a/miniupnpd/upnpglobalvars.c b/miniupnpd/upnpglobalvars.c
index b222c01..c970c06 100644
--- a/miniupnpd/upnpglobalvars.c
+++ b/miniupnpd/upnpglobalvars.c
@@ -1,4 +1,4 @@
-/* $Id: upnpglobalvars.c,v 1.43 2018/07/06 12:05:48 nanard Exp $ */
+/* $Id: upnpglobalvars.c,v 1.44 2019/05/21 08:39:45 nanard Exp $ */
 /* vim: tabstop=4 shiftwidth=4 noexpandtab
  * MiniUPnP project
  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
@@ -16,6 +16,11 @@
 /* network interface for internet */
 const char * ext_if_name = 0;
 
+#ifdef ENABLE_IPV6
+/* network interface for internet - IPv6 */
+const char * ext_if_name6 = 0;
+#endif
+
 /* stun host/port configuration */
 const char * ext_stun_host = 0;
 uint16_t ext_stun_port = 0;
diff --git a/miniupnpd/upnpglobalvars.h b/miniupnpd/upnpglobalvars.h
index a042388..ec34e0e 100644
--- a/miniupnpd/upnpglobalvars.h
+++ b/miniupnpd/upnpglobalvars.h
@@ -1,8 +1,8 @@
-/* $Id: upnpglobalvars.h,v 1.47 2018/07/06 12:05:48 nanard Exp $ */
+/* $Id: upnpglobalvars.h,v 1.48 2019/05/21 08:39:45 nanard Exp $ */
 /* vim: tabstop=4 shiftwidth=4 noexpandtab
  * MiniUPnP project
  * http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
- * (c) 2006-2018 Thomas Bernard
+ * (c) 2006-2019 Thomas Bernard
  * This software is subject to the conditions detailed
  * in the LICENCE file provided within the distribution */
 
@@ -17,6 +17,11 @@
 /* name of the network interface used to access internet */
 extern const char * ext_if_name;
 
+#ifdef ENABLE_IPV6
+/* name of the network interface used to access internet - for IPv6*/
+extern const char * ext_if_name6;
+#endif
+
 /* stun host/port configuration */
 extern const char * ext_stun_host;
 extern uint16_t ext_stun_port;
diff --git a/miniupnpd/upnppinhole.c b/miniupnpd/upnppinhole.c
index 00a74b0..8a49dde 100644
--- a/miniupnpd/upnppinhole.c
+++ b/miniupnpd/upnppinhole.c
@@ -1,7 +1,8 @@
-/* $Id: upnppinhole.c,v 1.13 2018/03/13 10:49:13 nanard Exp $ */
-/* MiniUPnP project
+/* $Id: upnppinhole.c,v 1.14 2019/05/21 08:39:45 nanard Exp $ */
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
+ * MiniUPnP project
  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
- * (c) 2006-2018 Thomas Bernard
+ * (c) 2006-2019 Thomas Bernard
  * This software is subject to the conditions detailed
  * in the LICENCE file provided within the distribution */
 
@@ -142,7 +143,7 @@ upnp_add_inboundpinhole(const char * raddr,
 		return (r >= 0) ? 1 : r;
 	}
 #if defined(USE_PF) || defined(USE_NETFILTER)
-	*uid = add_pinhole (ext_if_name, raddr, rport,
+	*uid = add_pinhole (ext_if_name6, raddr, rport,
 	                    iaddr, iport, proto, desc, timestamp);
 	return *uid >= 0 ? 1 : -1;
 #else