diff --git a/exports/nss_ipsec.h b/exports/nss_ipsec.h
index e5061af..9ae399a 100644
--- a/exports/nss_ipsec.h
+++ b/exports/nss_ipsec.h
@@ -106,11 +106,12 @@
 
 	uint8_t cipher_algo;		/**< Cipher algorithm */
 	uint8_t auth_algo;		/**< Authentication algorithm */
-	uint8_t esp_seq_skip;		/**< Skip ESP sequence number */
+	uint8_t nat_t_req;		/**< NAT-T required */
 	uint8_t esp_icv_len;		/**< ESP trailers ICV length to apply */
 
-	uint8_t nat_t_req;		/**< NAT-T required */
-	uint8_t res[3];			/**< Reserve bytes for alignment */
+	uint8_t esp_seq_skip;		/**< Skip ESP sequence number */
+	uint8_t esp_tail_skip;		/**< Skip ESP trailer */
+	uint8_t res[2];			/**< Reserve bytes for alignment */
 };
 
 /*
diff --git a/exports/nss_ipsecmgr.h b/exports/nss_ipsecmgr.h
index f53f4b2..7bbfe5b 100644
--- a/exports/nss_ipsecmgr.h
+++ b/exports/nss_ipsecmgr.h
@@ -42,6 +42,8 @@
 
 #define NSS_IPSECMGR_TUN_MTU(x) (x - NSS_IPSECMGR_TUN_MAX_HDR_LEN)
 
+#define NSS_IPSECMGR_NATT_PORT_DATA 4500
+
 /**
  * @brief Definition of an IPsec encapsulation rule for an add operation
  */
@@ -67,7 +69,8 @@
 	uint8_t esp_icv_len;		/**< ESP trailer's ICV length */
 
 	uint8_t esp_seq_skip;		/**< Skip ESP sequence number in header*/
-	uint8_t res[3];			/**< reserve for 4-byte alignment */
+	uint8_t esp_tail_skip;		/**< Skip ESP trailer*/
+	uint8_t res[2];			/**< reserve for 4-byte alignment */
 };
 
 /**
@@ -100,6 +103,10 @@
 	uint8_t auth_algo;		/**< Authentication algorithm */
 	uint8_t esp_icv_len;		/**< ESP trailer's ICV length */
 	uint8_t nat_t_req;		/**< Remove NAT-T header */
+
+	uint8_t esp_seq_skip;		/**< Skip ESP sequence number in header*/
+	uint8_t esp_tail_skip;		/**< Skip ESP trailer*/
+	uint8_t res[2];			/**< reserve for 4-byte alignment */
 };
 
 /**
diff --git a/nss_ipsecmgr.c b/nss_ipsecmgr.c
index 6f486ec..67d9d33 100644
--- a/nss_ipsecmgr.c
+++ b/nss_ipsecmgr.c
@@ -182,6 +182,7 @@
 	 */
 	data->cipher_algo = encap->cipher_algo;
 	data->esp_seq_skip = (encap->esp_seq_skip == 1);
+	data->esp_tail_skip = (encap->esp_tail_skip == 1);
 
 	data->esp_icv_len = encap->esp_icv_len;
 	data->auth_algo = encap->auth_algo;
@@ -216,11 +217,17 @@
 	data->cipher_algo = decap->cipher_algo;
 
 	data->esp_icv_len = decap->esp_icv_len;
+	data->esp_seq_skip = (decap->esp_seq_skip == 1);
+	data->esp_tail_skip = (decap->esp_tail_skip == 1);
 	data->auth_algo = decap->auth_algo;
 
 	data->crypto_index = decap->crypto_index;
 
 	data->nat_t_req = decap->nat_t_req;
+	if (data->nat_t_req) {
+		sel->dst_port = NSS_IPSECMGR_NATT_PORT_DATA;
+	}
+
 	data->window_size = decap->window_size;
 }