index f8c601fa..f566d288 100644
--- a/scapy/layers/ipsec.py
+++ b/scapy/layers/ipsec.py
+@@ -138,6 +138,7 @@ bind_layers(IP, ESP, proto=socket.IPPROTO_ESP)
+ bind_layers(IPv6, ESP, nh=socket.IPPROTO_ESP)
+ bind_layers(UDP, ESP, dport=4500) # NAT-Traversal encapsulation
+ bind_layers(UDP, ESP, sport=4500) # NAT-Traversal encapsulation
++bind_layers(UDP, ESP, dport=4545) # NAT-Traversal encapsulation - random port
+
+ ###############################################################################
+
@@ -359,11 +359,8 @@ class CryptAlgo(object):
encryptor = cipher.encryptor()
esp = self.crypt_algo.decrypt(self, encrypted, self.crypt_key,
self.crypt_algo.icv_size or
-@@ -1050,9 +1069,10 @@ class SecurityAssociation(object):
+@@ -1050,11 +1069,12 @@ class SecurityAssociation(object):
def _decrypt_ah(self, pkt, verify=True):
ah = pkt[AH]
payload = ah.payload
+