diff --git a/ipacm/inc/IPACM_Config.h b/ipacm/inc/IPACM_Config.h
index 926ed5e..a9524f6 100644
--- a/ipacm/inc/IPACM_Config.h
+++ b/ipacm/inc/IPACM_Config.h
@@ -252,7 +252,7 @@
 
 	int DelExtProp(ipa_ip_type ip_type);
 
-	enum ipa_hw_type GetIPAVer();
+	enum ipa_hw_type GetIPAVer(bool get = false);
 
 	int Init(void);
 
diff --git a/ipacm/inc/IPACM_Conntrack_NATApp.h b/ipacm/inc/IPACM_Conntrack_NATApp.h
index e50b316..c3749e1 100644
--- a/ipacm/inc/IPACM_Conntrack_NATApp.h
+++ b/ipacm/inc/IPACM_Conntrack_NATApp.h
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
+Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -102,11 +102,12 @@
 	bool isAlgPort(uint8_t, uint16_t);
 	void Reset();
 	bool isPwrSaveIf(uint32_t);
+	uint32_t GenerateMetdata(uint8_t mux_id);
 
 public:
 	static NatApp* GetInstance();
 
-	int AddTable(uint32_t);
+	int AddTable(uint32_t, uint8_t mux_id);
 	uint32_t GetTableHdl(uint32_t);
 	int DeleteTable(uint32_t);
 
diff --git a/ipacm/inc/IPACM_Defs.h b/ipacm/inc/IPACM_Defs.h
index fe252c9..2031fc5 100644
--- a/ipacm/inc/IPACM_Defs.h
+++ b/ipacm/inc/IPACM_Defs.h
@@ -341,6 +341,7 @@
 	uint32_t ipv6_prefix[2];
 	bool is_sta;
 	uint8_t xlat_mux_id;
+	uint8_t mux_id;
 }ipacm_event_iface_up;
 
 typedef struct _ipacm_event_iface_up_tether
diff --git a/ipacm/src/IPACM_Config.cpp b/ipacm/src/IPACM_Config.cpp
index 7e747f0..92f4880 100644
--- a/ipacm/src/IPACM_Config.cpp
+++ b/ipacm/src/IPACM_Config.cpp
@@ -157,7 +157,7 @@
 	memset(flt_rule_count_v4, 0, IPA_CLIENT_MAX*sizeof(int));
 	memset(flt_rule_count_v6, 0, IPA_CLIENT_MAX*sizeof(int));
 	memset(bridge_mac, 0, IPA_MAC_ADDR_SIZE*sizeof(uint8_t));
-	ver = IPA_HW_None;
+	ver = GetIPAVer(true);
 
 	IPACMDBG_H(" create IPACM_Config constructor\n");
 	return;
@@ -849,17 +849,18 @@
 	return ipacm_event_name[event_id];
 }
 
-enum ipa_hw_type IPACM_Config::GetIPAVer()
+enum ipa_hw_type IPACM_Config::GetIPAVer(bool get)
 {
 	int ret;
 
-	if(ver != IPA_HW_None)
+	if(!get)
 		return ver;
 
 	ret = ioctl(m_fd, IPA_IOC_GET_HW_VERSION, &ver);
 	if(ret != 0)
 	{
 		IPACMERR("Failed to get IPA version with error %d.\n", ret);
+		ver = IPA_HW_None;
 		return IPA_HW_None;
 	}
 	IPACMDBG_H("IPA version is %d.\n", ver);
diff --git a/ipacm/src/IPACM_ConntrackListener.cpp b/ipacm/src/IPACM_ConntrackListener.cpp
index 4f83b3d..e02ca10 100644
--- a/ipacm/src/IPACM_ConntrackListener.cpp
+++ b/ipacm/src/IPACM_ConntrackListener.cpp
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
+Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -373,7 +373,7 @@
 
 	 if(nat_inst != NULL)
 	 {
-		 nat_inst->AddTable(wanup_data->ipv4_addr);
+		 nat_inst->AddTable(wanup_data->ipv4_addr, wanup_data->mux_id);
 	 }
 
 	 IPACMDBG("creating nat threads\n");
diff --git a/ipacm/src/IPACM_Conntrack_NATApp.cpp b/ipacm/src/IPACM_Conntrack_NATApp.cpp
index c13c48e..27bf95a 100644
--- a/ipacm/src/IPACM_Conntrack_NATApp.cpp
+++ b/ipacm/src/IPACM_Conntrack_NATApp.cpp
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
+Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -31,9 +31,13 @@
 #ifdef FEATURE_IPACM_HAL
 #include "IPACM_OffloadManager.h"
 #endif
+#include "IPACM_Iface.h"
 
 #define INVALID_IP_ADDR 0x0
 
+#define HDR_METADATA_MUX_ID_BMASK 0x00FF0000
+#define HDR_METADATA_MUX_ID_SHFT 0x10
+
 /* NatApp class Implementation */
 NatApp *NatApp::pInstance = NULL;
 NatApp::NatApp()
@@ -127,9 +131,14 @@
 	return pInstance;
 }
 
+uint32_t NatApp::GenerateMetdata(uint8_t mux_id)
+{
+	return (mux_id << HDR_METADATA_MUX_ID_SHFT) & HDR_METADATA_MUX_ID_BMASK;
+}
+
 /* NAT APP related object function definitions */
 
-int NatApp::AddTable(uint32_t pub_ip)
+int NatApp::AddTable(uint32_t pub_ip, uint8_t mux_id)
 {
 	int ret;
 	int cnt = 0;
@@ -151,6 +160,19 @@
 		IPACMERR("unable to create nat table Error:%d\n", ret);
 		return ret;
 	}
+	if(IPACM_Iface::ipacmcfg->GetIPAVer() >= IPA_HW_v4_0) {
+		/* modify PDN 0 so it will hold the mux ID in the src metadata field */
+		ipa_nat_pdn_entry entry;
+
+		entry.dst_metadata = 0;
+		entry.src_metadata = GenerateMetdata(mux_id);
+		entry.public_ip = pub_ip;
+		ret = ipa_nat_modify_pdn(nat_table_hdl, 0, &entry);
+		if(ret)
+		{
+			IPACMERR("unable to modify PDN 0 entry Error:%d INIT_HDR_METADATA register values will be used!\n", ret);
+		}
+	}
 
 	/* Add back the cached NAT-entry */
 	if (pub_ip == pub_ip_addr_pre)
diff --git a/ipacm/src/IPACM_Lan.cpp b/ipacm/src/IPACM_Lan.cpp
index d574616..2f18f38 100644
--- a/ipacm/src/IPACM_Lan.cpp
+++ b/ipacm/src/IPACM_Lan.cpp
@@ -1687,9 +1687,10 @@
 	IPACM_Config* ipacm_config = IPACM_Iface::ipacmcfg;
 	struct ipa_ioc_write_qmapid mux;
 
-	if(rx_prop != NULL)
+	/* not  needed for newer versions since it will be overridden by NAT metadata replacement for IPAv4 and up */
+	if((IPACM_Iface::ipacmcfg->GetIPAVer() < IPA_HW_v4_0) && (rx_prop != NULL))
 	{
-		/* give mud ID to IPA-driver for WLAN/LAN pkts */
+		/* give mux ID of the default PDN to IPA-driver for WLAN/LAN pkts */
 		fd = open(IPA_DEVICE_NAME, O_RDWR);
 		if (0 == fd)
 		{
@@ -3197,6 +3198,10 @@
 		else
 		{
 			flt_rule_entry.rule.action = IPA_PASS_TO_SRC_NAT;
+
+			/* NAT block will set the proper MUX ID in the metadata according to the relevant PDN */
+			if (IPACM_Iface::ipacmcfg->GetIPAVer() >= IPA_HW_v4_0)
+				flt_rule_entry.rule.set_metadata = true;
 		}
 	}
 	else if(iptype == IPA_IP_v6)
diff --git a/ipacm/src/IPACM_Wan.cpp b/ipacm/src/IPACM_Wan.cpp
index 79f88cd..6d57c39 100644
--- a/ipacm/src/IPACM_Wan.cpp
+++ b/ipacm/src/IPACM_Wan.cpp
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2013, The Linux Foundation. All rights reserved.
+Copyright (c) 2013, 2017 The Linux Foundation. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -1604,6 +1604,7 @@
 		{
 			IPACM_Wan::xlat_mux_id = 0;
 			wanup_data->xlat_mux_id = 0;
+			wanup_data->mux_id = ext_prop->ext[0].mux_id;
 			IPACMDBG_H("No xlat configuratio:\n");
 		}
 		evt_data.event = IPA_HANDLE_WAN_UP;