diff --git a/scapy/layers/inet.py b/scapy/layers/inet.py
index 9562e40758b45f7fd5cabe82baaeb60fefba9879..4450df188b68a10f12d7003e1dd4f44960485e0f 100644
--- a/scapy/layers/inet.py
+++ b/scapy/layers/inet.py
@@ -874,10 +874,10 @@ def defrag(plist):
     frags = defaultdict(PacketList)
     nofrag = PacketList()
     for p in plist:
-        ip = p[IP]
         if IP not in p:
             nofrag.append(p)
             continue
+        ip = p[IP]
         if ip.frag == 0 and ip.flags & 1 == 0:
             nofrag.append(p)
             continue
diff --git a/scapy/layers/l2.py b/scapy/layers/l2.py
index 32421fae99bc02f45ca5e2f9f05e94e87610a08d..5e7e7978fa9eec2a48d192ca561de83a976122ac 100644
--- a/scapy/layers/l2.py
+++ b/scapy/layers/l2.py
@@ -148,6 +148,7 @@ class Ether(Packet):
     fields_desc = [ DestMACField("dst"),
                     SourceMACField("src"),
                     XShortEnumField("type", 0x9000, ETHER_TYPES) ]
+    __slots__ = ["_defrag_pos"]
     def hashret(self):
         return struct.pack("H",self.type)+self.payload.hashret()
     def answers(self, other):
@@ -402,6 +403,7 @@ class Loopback(Packet):
 
     name = "Loopback"
     fields_desc = [ LoIntEnumField("type", 0x2, LOOPBACK_TYPES) ]
+    __slots__ = ["_defrag_pos"]
 
 
 class Dot1AD(Dot1Q):
diff --git a/test/regression.uts b/test/regression.uts
index 4c80e2543ef8c6154a6abe453739a038965bceca..067aabd897f8bd8f71f67fe046c50dbd005ce2f5 100644
--- a/test/regression.uts
+++ b/test/regression.uts
@@ -5417,6 +5417,33 @@ assert len(defrags) == 1
 * which should be the same as pkt reconstructed
 assert defrags[0] == IP(str(pkt))
 
+= defrag() / defragment() - Real DNS packets
+
+import base64
+
+a = base64.b64decode('bnmYJ63mREVTUwEACABFAAV0U8UgADIR+u0EAgIECv0DxAA1sRIL83Z7gbCBgAABAB0AAAANA255YwNnb3YAAP8AAcAMAAYAAQAAA4QAKgZ2d2FsbDDADApob3N0bWFzdGVywAx4Og5wAAA4QAAADhAAJOoAAAACWMAMAC4AAQAAA4QAmwAGCAIAAAOEWWm9jVlgdP0mfQNueWMDZ292AHjCDBL0C1rEKUjsuG6Zg3+Rs6gj6llTABm9UZnWk+rRu6nPqW4N7AEllTYqNK+r6uFJ2KhfG3MDPS1F/M5QCVR8qkcbgrqPVRBJAG67/ZqpGORppQV6ib5qqo4ST5KyrgKpa8R1fWH8Fyp881NWLOZekM3TQyczcLFrvw9FFjdRwAwAAQABAAADhAAEobkenMAMAC4AAQAAA4QAmwABCAIAAAOEWWm9jVlgdP0mfQNueWMDZ292ABW8t5tEv9zTLdB6UsoTtZIF6Kx/c4ukIud8UIGM0XdXnJYx0ZDyPDyLVy2rfwmXdEph3KBWAi5dpRT16nthlMmWPQxD1ecg9rc8jcaTGo8z833fYJjzPT8MpMTxhapu4ANSBVbv3LRBnce2abu9QaoCdlHPFHdNphp6JznCLt4jwAwAMAABAAADhAEIAQEDCAMBAAF77useCfI+6T+m6Tsf2ami8/q5XDtgS0Ae7F0jUZ0cpyYxy/28DLFjJaS57YiwAYaabkkugxsoSv9roqBNZjD+gjoUB+MK8fmfaqqkSOgQuIQLZJeOORWD0gAj8mekw+S84DECylbKyYEGf8CB3/59IfV+YkTcHhXBYrMNxhMK1Eiypz4cgYxXiYUSz7jbOmqE3hU2GinhRmNW4Trt4ImUruSO+iQbTTj6LtCtIsScOF4vn4gcLJURLHOs+mf1NU9Yqq9mPC9wlYZk+8rwqcjVIiRpDmmv83huv4be1x1kkz2YqTFwtc33Fzt6SZk96Qtk2wCgg8ZQqLKGx5uwIIyrwAwAMAABAAADhAEIAQEDCAMBAAGYc7SWbSinSc3u8ZcYlO0+yZcJD1vqC5JARxZjKNzszHxc9dpabBtR9covySVu1YaBVrlxNBzfyFd4PKyjvPcBER5sQImoCikC+flD5NwXJbnrO1SG0Kzp8XXDCZpBASxuBF0vjUSU9yMqp0FywCrIfrbfCcOGAFIVP0M2u8dVuoI4nWbkRFc0hiRefoxc1O2IdpR22GAp2OYeeN2/tnFBz/ZMQitU2IZIKBMybKmWLC96tPcqVdWJX6+M1an1ox0+NqBZuPjsCx0/lZbuB/rLHppJOmkRc7q2Fw/tpHOyWHV+ulCfXem9Up/sbrMcP7uumFz0FeNhBPtg3u5kA5OVwAwAMAABAAADhACIAQADCAMBAAF5mlzmmq8cs6Hff0qZLlGKYCGPlG23HZw2qAd7N2FmrLRqPQ0R/hbnw54MYiIs18zyfm2J+ZmzUvGd+gjHGx3ooRRffQQ4RFLq6g6oxaLTbtvqPFbWt4Kr2GwX3UslgZCzH5mXLNpPI2QoetIcQCNRdcxn5QpWxPppCVXbKdNvvcAMADAAAQAAA4QAiAEAAwgDAQABqeGHtNFc0Yh6Pp/aM+ntlDW1fLwuAWToGQhmnQFBTiIUZlH7QMjwh5oMExNp5/ABUb3qBsyk9CLanRfateRgFJCYCNYofrI4S2yqT5X9vvtCXeIoG/QqMSl3PJk4ClYufIKjMPgl5IyN6yBIMNmmsATlMMu5TxM68a/CLCh92L3ADAAuAAEAAAOEAJsAMAgCAAADhFlpvY1ZYHT9Jn0DbnljA2dvdgAViVpFoYwy9dMUbOPDHTKt/LOtoicvtQbHeXiUSQeBkGWTLyiPc/NTW9ZC4WK5AuSj/0+V')
+b = base64.b64decode('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')
+c = base64.b64decode('bnmYJ63mREVTUwEACABFAAFHU8UBWDIRHcMEAgIECv0DxDtlufeCT1zQktat4aEVA8MF0FO1sNbpEQtqfu5Al//OJISaRvtaArR/tLUj2CoZjS7uEnl7QpP/Ui/gR0YtyLurk9yTw7Vei0lSz4cnaOJqDiTGAKYwzVxjnoR1F3n8lplgQaOalVsHx9UAAQABAAADLAAEobkBA8epAAEAAQAAAywABKG5AQzHvwABAAEAAAMsAASnmYIMx5MAAQABAAADLAAEp5mCDcn9AAEAAQAAAqUABKeZhAvKFAABAAEAAAOEAAShuQIfyisAAQABAAADhAAEobkCKcpCAAEAAQAAA4QABKG5AjPKWQABAAEAAAOEAAShuQI9ynAAAQABAAADhAAEobkCC8nPAAEAAQAAA4QABKG5AgzJ5gABAAEAAAOEAASnmYQMAAApIAAAAAAAAAA=')
+d = base64.b64decode('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')
+
+old_debug_dissector = conf.debug_dissector
+conf.debug_dissector = 0
+plist = PacketList([Ether(x) for x in [a, b, c, d]])
+conf.debug_dissector = old_debug_dissector
+
+left, defragmented, errored = defrag(plist)
+assert len(left) == 1
+assert left[0] == Ether(d)
+assert len(defragmented) == 1
+assert len(defragmented[0]) == 3093
+assert defragmented[0][DNSRR].rrname == 'nyc.gov.'
+assert len(errored) == 0
+
+plist_def = defragment(plist)
+assert len(plist_def) == 2
+assert len(plist_def[0]) == 3093
+assert plist_def[0][DNSRR].rrname == 'nyc.gov.'
+
 = Packet().fragment()
 payloadlen, fragsize = 100, 8
 assert fragsize % 8 == 0