Explanation of Drop code and Module-ID Values in Packet Capture Output (SonicOS 6.1.1.12-41n)

03/26/2020 1,032 People found this article helpful 487,819 Views

Description

When viewing output on the System | Packet Capture page, there are two fields that display potentially useful diagnostic information in numeric format:

The Module-ID field provides information on the specific area of the firewall (UTM) appliance's firmware that handled a particular packet.
The Drop-Code field provides a reason why the appliance dropped a particular packet.

This article provides a list of the Module-ID and Drop-Code numbers along with their meanings.

The following Drop-Codes were extracted from SonicOS Enhanced 6.1.1.12-41n firmware version, however these codes may change when a new firmware is available.

NOTE: All 6.2 firmware and newer contain the drop codes and descriptions within the packet capture utility. Find this by going to the packet capture located under System | Packet Monitor. For more information please visit Explanation of Drop code and Module-ID Values for 6.1 Firmware and Below.

Resolution

Please Note: The following Drop Codes were extracted from SonicOS Enhanced 6.1.1.12 -41n firmware version. These codes may change when a new firmware is available. If unsure, please contact SonicWall support.

1 adminTools
2 attacks
3 av
4 bwmmgmt
5 CIA
6 cli
7 clients
8 config
9 connectionCache
10 contentFilter
11 dea
12 debug
13 dhcpRelay
14 dhtml
15 fileSystem
16 fwCore
17 ha
18 idp
19 ipHelper
20 ipSec
21 lib
22 log

23 modem
24 netObj
25 network
26 packetFilter
27 policy
28 pppStack
29 RADIUS acct
30 redirector
31 reports
32 resource
33 sarc
34 servers
35 snmp
36 spdpp
37 stateful
38 system
39 TRAV2
40 TSA
41 USERS
42 version
43 wizards
44 wlan

45 wlb
46 zones
47 ARP
48 system stack
49 PPTP
50 L2TP
51 PPP-Dialup
52 IGMP
53 PPPOE
54 NAT
55 anti-spam
56 NetMonitor
57 Mirroring
58 SIP
59 BandOpt
60 GMSFlow server
61 APPFlow server
62 RTP stream
63 RAS stream
64 LDAP
65 Certificate Block
66

DROP CODES

Drop Code ID and name

0
1 PIP handling error in CP
2 PIP handling error in DP
3 Packet on the backup aggregate interface, but no Sonic END can be found.
4 Broadcast packet on the backup redundant port when primary port is up.
5 Packet the redundancy port, but no Sonic END can be found.
6 CP throttled DP for stack traffic
7 Packet dropped due to pass to stack failed.
8 Packet dropped by outputhook.
9 Inter-blade Packet dropped due to CP pass to stack failed.
10 HA active data packet processing failed.
11 Packet dropped due to CP pass to stack failed.
12 Dispatching IEEE802 BPDU packet failed.
13 IEEE 802 BPDU support module has not been initialized yet.
14 Invalide Ether type for IEEE 802 BPDU packet.
15 Invalide source address for IEEE 802 BPDU packet.
16 Unknown Ether type ingress.
17 Unknown Ether type egress.
18 IPv6 packets not supported.
19 Packet on invalid vlan
20 Packet ingress on invalid interface
21 Packet egress on invalid interface
22 Packet on invalid device
23 Destination MAC address is not our interface
24 Device is not attached.
25 Packet on invalid svrrp group
26 Invalid HA packet
27 Invalid HA ARP packet
28 PPPoE discover packet not allowed
29 Invalid HA SDP packet
30 Routing packet not allowed
31 VLAN filtered.
32 Unicast MACADDR not mine
33 L2B Learning-Bridge filtered
34 Invalid NET-ID found on mist if write.
35 Invalid NET-ID found on if write arp real.
36 Invalid NET-ID found on write ip fast.
37 Invalid NET-ID found on if write.
38 Invalid NET-ID found on if write no mbuf.
39 Invalid Run-time NET data on mist if write.
40 Invalid Run-time NET data on if write arp real.
41 Invalid Run-time NET data on write ip fast.
42 Invalid Run-time NET data on if write.
43 Invalid parent Run-time NET data on if write.
44 Invalid Run-time NET data on if write no mbuf.
45 Invalid parent Run-time NET data on if write no mbuf.
46 Unknown ARP type.
47 Arp reply ignored.
48 IP address not for our subnet
49 ARP unexpected link ip
50 ARP source ip not connected
51 NULL source IP address
52 Own gratuitous arp
53 IP address not on our lan subnet
54 Classical mode, ARP bridge not supported
55 ARP proxy, subnet mismatch
56 Not for me.
57 ARP request from stack
58 ARP response from stack
59 ARP fail to resolve from SonicPoint
60 ARP unknown ethernet address format
61 Invalid TCP Flag
62 Invalid TCP Options
63 IP sanity test failed
64 IP sanity test failed in out hook
65 IP advanced sanity test failed
66 Non sonicpoint traffic in wlan zone
67 Multicast spank attack
68 Multicast Data packet dropped
69 Load Balancing Probe error
70 Syn Flood Protection
71 Duplicated in Syn Flood Protection
72 Syn Flood Protection #3
73 IP source route option found
74 Invalid connection cache.
75 Unknown destination
76 Unknown destination for bridged bcast pkt
77 Bounce traffic detected
78 Access Rule Policy not found
79 AV detection
80 DEA detection
81 Bad TFTP packets
82 Enforced Firewall Rule
83 Enforced firewall rule
84 Enforced Content Filter Policy
85 LICENSE drop
86 IDP detection
87 IDP detection, ICMP rule match
88 IDP detection, RTP data (UDP)
89 IDP detection, Encrypted UDP communication
90 IDP detection, Application Firewall Match (UDP)
91 IDP detection, Port Range Match (UDP)
92 IDP detection, Negation Child Match (UDP)
93 IDP detection, FTP data (TCP)
94 IDP detection, Skype data (TCP)
95 IDP detection, Winny data (TCP)
96 IDP detection, Emule data (TCP)
97 IDP detection, Random encryption (TCP)
98 IDP detection, Anomaly traffic (TCP)
99 IDP detection, Port Range Match (TCP)
100 IDP detection, Negation Child Match (TCP)
101 IDP detection, Gateway Antivirus match (TCP)
102 IDP detection, Application Firewall Match (TCP)
103 IDP detection, IP match
104 IDP detection, bad tcp checksum
105 IDP detection, bad ip checksum in tcp checking
106 IDP detection, bad ip checksum in tcp packet
107 IDP detection, bad udp checksum
108 IDP detection, bad ip checksum in udp checking
109 IDP detection, bad ip checksum in udp packet
110 IDP detection, bad icmp checksum
111 IDP detection, bad ip checksum in icmp checking
112 IDP detection, bad ip checksum in icmp packet
113 Packet to public IP from inside firewall
114 Bad TTL
115 IP check failed
116 Bad source IP
117 Bad destination MAC address
118 Broadcast not allowed on bridge.
119 Antispam: Going to blacklisted server.
120 Going to blacklisted server.
121 coming from blacklisted server.
122 Broadcast traffic not handled.
123 Multicast forwarding not configured
124 Multicast IGMP state not found
125 Multicast IP not in the allowed list
126 Anti-Spam Connection Limit Reached
127 Active/Active DPI drop offload packet
128 UDP Flood Protection
129 ICMP Flood Protection
130 Control Plane Flood Protection
131 Unknown Ether type
132 Incorrect IP Version
133 Blacklisted MAC address
134 Wrong IP Length
135 Packet length mismatch with interface MTU
136 Wrong fragmentation boundary.
137 Wrong IP checksum value.
138 Wrong TCP Checksum value.
139 Wrong UDP Checksum value.
140 Wrong ICMP Checksum value.
141 NULL Udp port number
142 Non PPP-GRE traffic
143 Missing ESP Header
144 Missing AH Header
145 Missing IPCOMP Header
146 Unknown IP protocol type
147 TTL value is zero.
148 l2 mcast but dest ip is unicast
149 Null Source Zone.
150 Wrong UDP Length.
151 RECV: IP pkt recvd without IPCP session
152 RECV: IP pkt recvd without contiguous buf
153 RECV: IP pkt recvd without combuf
154 RECV: TNMP can't alloc contiguous buf
155 XMIT: AHDLC encap no buf
156 XMIT: TNMP can't alloc contiguous buf
157 XMIT: Device not ready to forward traffic
158 XMIT: No IPCP session
159 XMIT: IPCP is down
160 XMIT: No Dialup Msg Buffer available
161 Non Zero GIAddr field in DHCP packet from client
162 Source MAC is different from chAddr field in DHCP client packet
163 Iphelper policy not found for DHCP relay.
164 Iphelper cache not found for DHCP.
165 Zero NSID in Netbios request packet.
166 Iphelper policy not found for Netbios.
167 Iphelper cache not found for Netbios.
168 Zero NSID in Netbios reply packet when recv from server.
169 Zero NSID in Netbios reply packet when recv from client.
170 Zero NSID in Netbios reply packet.
171 Netbios client no egress element
172 Netbios server no egress element
173 Netbios client fail to create record
174 DHCP server fail to relay to client
175 DHCP client no egress element
176 DHCP client fail to create record
177 DHCP server, Ingress interface is same as egress interface.
178 Firewall, Ingress interface is same as egress interface.
179 Other Application, Ingress interface is same as egress interface.
180 Ingress interface is same as egress interface.
181 DHCP server packet dropped, RPF check failed.
182 Netbios client packet dropped, RPF check failed.
183 Netbios server packet dropped, RPF check failed.
184 Other Application relay to client failed
185 Other Application no egress element
186 Other Application fail to create record
187 Other Application packet dropped, RPF check failed.
188 Other Application client packet dropped, RPF check failed.
189 Other Application server packet dropped, RPF check failed.
190 Iphelper policy not found for other Application.
191 Iphelper policy not found for other Application when creating record.
192 Combuf Allocation Error.
193 Memory Allocation Error.
194 BSEG Memory Allocation Error.
195 Length Mismatch. Cant forward pkt!!!.
196 Control message header size error.
197 Drop GRE packet as call not yet established.
198 Invalid GRE Flags or Caller ID.
199 Invalid GRE sequence number.
200 No payload for GRE packet.
201 PPTP Tunnel is not up yet.
202 PPTP Client is not enabled.
203 PPTP WAN Write Spin Lock Error.
204 PPTP Spin Lock Error.
205 PPTP Flow Control Queuing Error.
206 Error copying PPTP combuf chain to continuous buffer.
207 Error fragmenting packet that is larger than PPTP MTU.
208 Enforced Dial-on-Data restriction.
209 PPPDU has not completed initialization.
210 Error fragmenting packet that is larger than PPPDU MTU.
211 PPPDU dropped packet because packet that is larger then PPPDU MTU and fragmentation is disabled.
212 Packet received with DF bit Set and large than MTU
213 PPP MLP link is not up/available.
214 PPP link is not up/available.
215 PPP link is not up.
216 PPP link is not opened.
217 The PPP buffer processing failed.
218 LCP: The PPP buffer is truncated.
219 The PPP buffer decompressing failed.
220 NCP: The PPP buffer is truncated.
221 PPP MLP pre-xmit error.
222 PPP MLP encapsulate error.
223 PPP MLP null pointer found.
224 PPP MLP no data packet.
225 PPP MLP link is not opened.
226 PPP MLP buffer decompressing failed.
227 PPP MLP BAP no netif nlinfo.
228 PPP MLP IP no netif nlinfo.
229 PPP MLP NBF no netif nlinfo.
230 PPP MLP VJCOMP no netif nlinfo.
231 PPP MLP VJCOMP decompressing failed.
232 PPP MLP VJUNCOMP no netif nlinfo.
233 PPP MLP VJUNCOMP decompressing failed.
234 PPP MLP IPX no netif nlinfo.
235 PPP MLP IPX decompressing failed.
236 PPP MLP AT no netif nlinfo.
237 PPP MLP 802.1 no netif nlinfo.
238 PPP MLP IBMSR no netif nlinfo.
239 PPP MLP DECLAN no netif nlinfo.
240 PPP MLP BRIDGE no netif nlinfo.
241 PPP MLP NBFCP no netif nlinfo.
242 PPP MLP IPCP no netif nlinfo.
243 The PPP PAP buffer processing failed.
244 The PPP CHAP buffer processing failed.
245 The PPP NCP buffer processing failed.
246 The PPP LCP buffer processing failed.
247 Received PPP pkt but there is no existing PPP information.
248 PPP Network Interface structure is NULL.
249 PPP Virtual Interface structure is NULL.
250 PPP no active link.
251 PPP dropped packet because it contains unknown protocol.
252 PPP dropped packet because of transmission failure.
253 PPP MLP NCP processing failed
254 PPP dropped packet because NCP is not open.
255 PPP dropped packet because the LCP code is unacceptable.
256 PPP dropped packet because the LCP code is unknown.
257 PPP HDLC PPPOE packet has no payload.
258 PPPOE packet has no payload.
259 The PPPOE buffer processing failed.
260 The PPPOE ingress buffer processing failed.
261 The PPPOE egress buffer processing failed.
262 PPPOE packet dropped because of NULL pointer.
263 PPPOE packet dropped because of NULL pointer in DP.
264 PPPOE packet dropped because BSEG allocation failed.
265 PPPOE packet dropped because buf put head action failed.
266 PPPOE packet dropped because PADO create PAD packet failed.
267 PPPOE packet dropped because PADI create PAD packet failed.
268 PPPOE packet dropped because PADR create PAD packet failed.
269 The PPP HDLC ingress buffer processing failed.
270 The PPP HDLC egress buffer processing failed.
271 The PPP HDLC dropped because of NULL pointer.
272 The PPP HDLC dropped because of NULL pointer in DP.
273 PPP HDLC packet dropped because BSEG allocation failed.
274 PPP HDLC packet dropped because buf put head action failed.
275 The PPP HDLC buffer processing failed.
276 The PPP HDLC PPPOE IPCP is not up.
277 The PPP HDLC PPPOE is not ready.
278 The PPP HDLC PPPOE is not ready in DP.
279 The PPPOE IPCP is not up.
280 The PPPOE module is not yet ready.
281 The PPPOE module is not yet ready in DP.
282 The PPP HDLC PPPOE is not enabled.
283 The PPP HDLC PPPOE is not enabled in DP.
284 The PPPOE module is not enabled.
285 The PPPOE module is not enabled in DP.
286 The PPP HDLC PPPOE is not re/started with NTP packets.
287 The PPP HDLC PPPOE is not re/started with NTP packets in DP.
288 The PPPOE module is not re/started with NTP packets.
289 The PPPOE module is not re/started with NTP packets in DP.
290 The PPP HDLC PPPOE is not re/started with non-IP packets.
291 The PPP HDLC PPPOE is not re/started with non-IP packets in DP.
292 The PPPOE module dropped the packet because it was non-IP.
293 The PPPOE module dropped the packet because it was non-IP in DP.
294 PPP HDLC PPPoE packet has unsupported version.
295 PPPoE packet has unsupported version.
296 Received PPP HDLC PPPOE packet for non-existent PPP session.
297 Received PPP HDLC PPPOE packet for non-existent PPP session in DP.
298 Received PPPoE packet for non-existent PPP session.
299 Received PPPoE packet for non-existent PPP session in DP.
300 PPPoE packet has an illegal session id.
301 PPPoE packet has unknown ethertype.
302 PPPoE packet is missing the service name tag.
303 PPPoE packet was not transmitted.
304 PPPoE packet dropped due to failure in adding enet header.
305 L2TP Length Mismatch
306 L2TP UDP checksum error
307 L2TP buffer corrupted
308 L2TP invalid tunnel
309 L2TP invalid session
310 L2TP Invalid source interface
311 L2TP packet not encrypted
312 L2TP Drop PPP control packet, session not established yet
313 L2TP Tunnel/Seesion Invalid
314 L2TP invalid pkt type
315 L2TP invalid control msg
316 L2TP unsupported version
317 L2TP invalid packet
318 L2TP not enabled on this interface
319 L2TP invalid runtime data
320 L2TP connection not UP
321 L2TP memory allocation failed
322 No IPSec tunnel active for this connection ,
323 Invalid L2TP Mode ,
324 Pkt pass to stack failed
325 UDP length greater than 1500
326 IP length greater than 1500
327 Pkt authentication failed
328 SA not found on lookup by SPI after decryption
329 SA not found on lookup by SPI after encryption
330 Failed to copy frag chain to contiguous buffer
331 Pkt with SPI less than 256
332 SA not found on lookup by SPI for inbound packet
333 Pkt length smaller than expected
334 Replayed Pkt
335 Pkt received on invalid interface
336 Expecting udp encapsulation
337 Not expecting udp encapsulation
338 Throughput regulator drop inbound pkt
339 Throughput regulator drop inbound pkt in CP
340 HW processing request error for inbound pkt
341 AH auth failed
342 ESP auth failed
343 ESP decrypt failed
344 Unknown protocol
345 Nested tunnels not supported
346 Pkt is not thru tunnell
347 Pkt is not thru tunnel or l2tp transport mode
348 Pkt not destined to mgmt interface
349 Pkt not destined to mgmt interface in CP
350 Pkt not destined to mgmt interface (non-octeon)
351 Pkt from invalid peer
352 VPN access list check failure
353 VPN access list check failure in CP
354 VPN access list check failure (non-octeon)
355 Pkt does not match traffic selectors
356 Pkt fragment not allowed
357 DHCP pkt invalid IP length
358 Octeon Decrypyion Failed for inbound packet
359 Incoming packet's combuf Ip Length Error
360 Combuf Ip Ptr Null Error
361 Multicast sa not found
362 SA not found on lookup by SPI for outbound pkt
363 Incorrect src IP on mgmt SA
364 Throughput regulator drop outbound pkt
365 Throughput regulator drop outbound pkt in CP
366 Insufficient command context for outbound pkt
367 HW processing request error for outbound pkt
368 Software esp decrypt processing request error
369 Software esp auth processing request error
370 Software ah auth processing request error
371 Software null sa processing request error
372 Software processing request error
373 Software malloc combuf fragment error
374 Combuf Fragmentation error
375 Combuf Fragmentation error after encryption
376 Combuf Fragmentation error after encryption in CP
377 Packet is large than MTU
378 Packet is large than MTU after encryption
379 Packet received with DF bit Set and large than MTU
380 Sequence overflow while encryting packet
381 Encption error for out going packet
382 Combuf Ip Ptr NUll Error
383 Combuf Ip Length Error
384 Next Hope MAC ARP error
385 Next Hope ARP not Resolved
386 Multicast buffer error
387 No IGMP entry found when leaving
388 No IGMP entry found when forwarding
389 No IGMP interface entry found
390 Combuf fields mismatch iplen-enet not equal to etherhdr size
391 IGMP wrong Checksum
392 Multicast not enabled
393 IGMPv2 state table error
394 IGMPv3 state table error
395 IGMP message has invalid length
396 IGMP message has invalid destination
397 IGMP message has invalid subtype
398 IGMPv3 message has invalid data length
399 IGMPv3 message has less data record
400 IGMPv3 message is invalid
401 IGMP query message version is not supported
402 IGMP report message version is not supported
403 IGMP message version is unknown
404 IGMP version not supported
405 Multicast RTP stateful failed
406 IP Spoof check failed
407 OutGoing interface not available
408 OutGoing interface is invalid
409 Cache pointer is NULL. NAT policy lookup cannot be performed
410 Cache add to hash table failed
411 NAT policy remap failed
412 NAT policy generate unique remap port failed
413 NAT policy lookup failed. Cache add aborted
414 Connection cache is full
415 Get VPN tunnel interface from policy failed
416 Packet from bounced path from initiator
417 Half open ESP connection
418 Half open IPCOMP connection
419 Allocate memory for connection cache failed
420 NAT Remap: Source IP not found in NAT Policy's Original Source Address Object
421 NAT Remap: Destination IP not found in NAT Policy's Original Destination Address Object
422 NAT Remap: Service not found in NAT Policy's Original Service Object
423 NAT Remap: Obtained invalid offset in original source
424 NAT Remap: Obtained invalid offset in oringinal destination
425 NAT Remap: Invalid address object type configured for original source
426 NAT Remap: Invalid address object type configured for original destination
427 NAT Remap: Invalid address object type configured for translated source
428 NAT Remap: Obtained invalid translated source from original offset
429 NAT Remap: Obtained invalid translated destination IP
430 NAT Remap: Size of translated destination object is zero
431 NAT Remap: Unable to find a host that is alive from translated destination pool
432 NAT Remap: Size of translated service object is zero
433 NAT Remap: Obtained invalid offset in original service
434 NAT Remap: Obtained invalid translated service from original offset
435 Packet marked to be dropped on ingress
436 Packet marked to be dropped on egress
437 Packet dropped by BWM CBQ as there is no default queue
438 Packet dropped by BWM CBQ as the queue is full
439 Packet dropped by BWM ACKQ as the queue is full
440 Packet dropped by BWM CBQ as the queue allocation failed
441 Packet dropped by BWM ACKQ as the queue allocation failed
442 Packet dropped by BWM CBQ as enqueue failed
443 Packet dropped by BWM ACKQ as no ACKQ element
444 Packet dropped by BWM ACKQ as there is no default queue
445 Packet dropped due to BWM spin lock error
446 MAC-IP Anti-spoof check enforced for hosts.
447 MAC-IP Anti-spoof cache not found for this router.
448 MAC-IP Anti-spoof cache found, but it is not a router.
449 MAC-IP Anti-spoof cache found, but it is blacklisted device.
450 MAC-IP Anti-spoof cache found, but the spoof code is unknown.
451 Packet dropped - IDP failure on sslspy packet
452 Packet dropped - Content filter failure on sslspy packet
453 Packet droppedd - Connection reseted on sslspy packet
454 Packet dropped - failed processing
455 Packet dropped - bad SIP packet
456 Packet dropped - new SIP flow with bad length
457 Packet dropped - failed new SIP flow processing
458 Packet dropped - failed SIP pre-processing
459 Packet dropped - failed SIP post-processing
460 Packet dropped - unknown SIP request method
461 Packet dropped - unknown SIP response method
462 Packet dropped - unknown SIP message type
463 Packet dropped - unknown Call-ID in method
464 Packet dropped - invalid SIP method to create call-id
465 Packet dropped - not allowed to create call-id
466 Packet dropped - invalid Contact:
467 Packet dropped - invalid Call-ID:
468 Packet dropped - invalid Via:
469 Packet dropped - invalid From: in SIP request
470 Packet dropped - invalid From: in SIP response
471 Packet dropped - invalid To: in SIP request
472 Packet dropped - invalid To: in SIP response
473 Packet dropped - invalid RecordRoute: in SIP request
474 Packet dropped - invalid RecordRoute: in SIP response
475 Packet dropped - invalid Maddr: in SIP request
476 Packet dropped - invalid Maddr: in SIP response
477 Packet dropped - invalid Route:
478 Packet dropped - invalid ACK
479 Packet dropped - invalid method
480 Packet dropped - invalid request method
481 Packet dropped - invalid ReferredBy:
482 Packet dropped - failed to modify ReferredBy:
483 Packet dropped - SIP invite failed to modify ReferredBy:
484 Packet dropped - SIP request failed to modify ReferredBy:
485 Packet dropped - invalid ReferredTo:
486 Packet dropped - invalid BYE
487 Packet dropped - invalid BYE response
488 Packet dropped - invalid CANCEL
489 Packet dropped - invalid CANCEL response
490 Packet dropped - invalid INVITE
491 Packet dropped - invalid INVITE response
492 Packet dropped - invalid REGISTER
493 Packet dropped - SDP body not found
494 Packet dropped - bad SDP content length
495 Packet dropped - bad SDP c=
496 Packet dropped - bad SDP c= IP
497 Packet dropped - bad SDP m=
498 Packet dropped - failed to read content length in SDP processing
499 Packet dropped - failed to update content length in SDP processing
500 Packet dropped - failed SDP processing
501 Packet dropped - SIP not enabled
502 Packet dropped - Geo-IP block for init country
503 Packet dropped - Geo-IP block for new lookup init country
504 Packet dropped - Geo-IP block for resp country
505 Packet dropped - Geo-IP block for new lookup resp country
506 Packet dropped - BOTNET block for init command and control center
507 Packet dropped - BOTNET block for new lookup init command and control center
508 Packet dropped - BOTNET block for resp command and control center
509 Packet dropped - BOTNET block for new lookup resp command and control center
510 Packet dropped - Packet rate limit for IPHelper packets
511 Packet dropped - TCP sequence out of order
512 Packet dropped - cache PTR is null in SPI (#1)
513 Packet dropped - cache PTR is null in SPI (#2)
514 Packet dropped - cache PTR is null in SPI (#3)
515 Packet dropped - cache PTR is null in SPI (#4)
516 Packet dropped - cache PTR is null in SPI (#5)
517 Packet dropped - cache PTR is null in SPI (#6)
518 Packet dropped - cache PTR is null in SPI (#7)
519 Packet dropped - handle FTP stream fail
520 Packet dropped - handle PPTP control stream fail
521 Packet dropped - handle real audio stream fail
522 Packet dropped - handle oracle stream fail
523 Packet dropped - handle MSN stream fail
524 Packet dropped - DNS Rebind attack
525 Packet dropped - L2B filtering source is our IP
526 Packet dropped - L2B filtering dst is same link
527 Packet dropped - L2B drop non-IP packet
528 Packet dropped - Fail to find tunnel bound interface
529 Packet dropped - Fail to do the packet init for zebos pkt over VPN
530 Packet dropped - Ping of Death attacks
531 Packet dropped - ICMP on non master blade
532 Packet dropped - IPSec i

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Explanation of Drop code and Module-ID Values in Packet Capture Output (SonicOS 6.1.1.12-41n)

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