-
Notifications
You must be signed in to change notification settings - Fork 50
/
linktypes.html
2380 lines (2170 loc) · 65.1 KB
/
linktypes.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<!DOCTYPE html>
<html lang="en">
<!-- HEAD -->
<head>
<meta charset="utf-8">
<title>Link-layer header types | TCPDUMP & LIBPCAP</title>
<meta name="description" content="Web site of Tcpdump and Libpcap">
<link href="style.css" rel="stylesheet" type="text/css" media="screen">
<link href="images/T-32x32.png" rel="shortcut icon" type="image/png">
</head>
<!-- END OF HTML HEAD -->
<!-- BODY -->
<body>
<!-- TOP MENU -->
<div id="menu">
<ul>
<li><a href="index.html">Home</a></li>
<li><a href="security.html">Security</a></li>
<li><a href="faq.html">FAQ</a></li>
<li><a href="manpages/">Man Pages</a></li>
<li><a href="ci.html">CI</a></li>
<li class="current_page_item"><a href="linktypes.html">Link-Layer Header Types</a></li>
<li><a href="bpfexam/">BPF Exam</a></li>
<li><a href="related.html">See Also</a></li>
<li><a href="old_releases.html">Old Releases</a></li>
</ul>
</div>
<!-- END OF TOP MENU -->
<!-- PAGE HEADER -->
<div id="splash">
<br><img src="images/logo.png" alt="">
</div>
<div id="logo">
<hr>
</div>
<!-- END OF PAGE HEADER -->
<!-- PAGE CONTENTS -->
<div id="page">
<!-- Start of LINK-LAYER HEADER TYPES section -->
<div class="post">
<h2 class="title">
LINK-LAYER HEADER TYPES
</h2>
<div class="entry">
<p>
The table below lists link-layer header types used in pcap and pcap-ng
capture files. The <code>LINKTYPE_</code> name is the name given to that
link-layer header type, and the <code>LINKTYPE_</code> value is the numerical
value used in capture files. The <code>DLT_</code> name is the name
corresponding to the value (specific to the packet capture method and
device type) returned by
<a href="manpages/pcap_datalink.3pcap.html"><b>pcap_datalink</b></a>(3PCAP);
in most cases, as
<span class=manref><a href="manpages/pcap-linktype.7.html"><b>pcap-linktype</b></a>(7)</span>
mentions it, the <code>LINKTYPE_</code>
value and <code>DLT_</code> value are the same, but, in some cases, they differ,
for reasons of binary compatibility, with the <code>DLT_</code> value being
different on different platforms.
</p>
<p>
Note that these values correspond to particular header formats; there
might be multiple link-layer header types for a given link-layer
protocol, as, for a given link-layer header type, the header for the
link-layer protocol might be preceded by a pseudo-header giving
additional information, or might be transformed in some way from the way
it's specified for that link-layer protocol, e.g. fields in the
link-layer protocol header might be removed, added, moved, or modified.
</p>
</div>
<h2 class="title">
Assigned and Reserved Values
</h2>
<div class="entry">
<ul>
<li>
Values in the range <code>DLT_USER0</code>–<code>DLT_USER15</code>
(147–162, both inclusive) are reserved for private use; if you
have some link-layer header
type that you want to use within your organization, with the capture
files using that link-layer header type not ever be sent outside your
organization, you can use one or more of these values. No libpcap release
will use these for any purpose, nor will any tcpdump release use them,
either.
<p>
Do <strong>NOT</strong> use these in capture files that you expect
anybody not using your private versions of capture-file-reading tools to
read; in particular, do <strong>NOT</strong> use them in products,
otherwise you may find that people won't be able to use tcpdump, or
snort, or Wireshark, or… to read the capture files from your
firewall/intrusion detection/traffic monitoring/etc. appliance, or
whatever product uses that link-layer header type value, and you may
also find that the developers of those applications will not accept
patches to let them read those files.
</p>
<p>
Please also be aware that there is an IETF process
at: <a href="https://datatracker.ietf.org/doc/draft-ietf-opsawg-pcaplinktype/">pcaplinktype</a>
which will replace all above processes with an IANA.org process.
</p>
<p>
Also, do not use them if somebody might send you a capture using them
for <em>their</em> private type and tools using them for <em>your</em>
private type would have to read them.
</p>
</li>
<li>
<p>
All other values listed in the table below are assigned.
</p>
</li>
<li>
<p>
Any values not listed in the table below are reserved for future use
and can be assigned subject to due process.
</p>
</li>
</ul>
</div>
<h2 class="title">
How To Assign a New Value
</h2>
<div class="entry">
<p>
Please remember that initial prototyping and experimentation can and
should be done using the <code>DLT_USERx</code> private use values.
If you need a value for a particular set of link-layer headers,
you must request one; to do so:
</p>
<ul>
<li>
<p>
Subscribe to the <a href="index.html#mailing-lists"> mailing
list</a> and send a message with the request.
</p>
<p>
Please include either an indication of the standard that describes the
link-layer headers, a link to a <strong>permanent</strong> and
<strong>public</strong> page describing the link-layer headers,
or a detailed description of the link-layer headers. If the headers do
not exactly match the description in a standard or standards—for
example, if fields are added, removed, or reordered, or have their size,
endianness or format changed—please describe all differences in
detail.
</p>
</li>
<li>
<p>
Prepare <a href="https://github.com/the-tcpdump-group/libpcap">
libpcap</a> changes for the new value:
</p>
<ul>
<li>
In <code>pcap/dlt.h</code> add the new <code>DLT_</code>
value and the associated comments, increment
<code>DLT_MATCHING_MAX</code>.
</li>
<li>
In <code>pcap-common.c</code> add the new
<code>LINKTYPE_</code> value (omit the comments if the previous
step explains everything sufficiently well), increment
<code>LINKTYPE_MATCHING_MAX</code>.
</li>
<li>
In <code>pcap.c</code> add the new value to
<code>dlt_choices[]</code>.
</li>
<li>
Check everything and open a pull request with the changes.
</li>
</ul>
</li>
<li>
<p>
Prepare
<a href="https://github.com/the-tcpdump-group/tcpdump-htdocs">
web site</a> changes for the new value:
</p>
<ul>
<li>
If there is no other specification readily available for the
new header type, create a new
<code>htmlsrc/linktypes/LINKTYPE_xxxxx.html</code> file and
document the new header structure.
</li>
<li>
In <code>htmlsrc/linktypes.html</code> (this file) add the new
value to the bottom of the table.
</li>
<li>
Generate complete HTML files from the file(s) above as
explained
<a href="https://github.com/the-tcpdump-group/tcpdump-htdocs/blob/master/README.md">
here</a>.
</li>
<li>
Check everything and open a pull request with the changes.
</li>
</ul>
</li>
<li>
<p>
Have patience.
</p>
<p>
Be ready to answer questions and to address any technical issues
that emerge during the review. This sometimes takes longer than
expected, but it is important to get every detail right because
after the assignment the new header structure should be set in
stone.
</p>
</li>
</p>
</ul>
</div>
<h2 class="title">
Warning
</h2>
<div class="entry">
<p>
Do <strong>NOT</strong> add new values to this list except as explained
above. Otherwise, you run the
risk of using a value that's already being used for some other purpose,
and of having tools that read libpcap-format captures not being able to
handle captures with your new link-layer header type value, with no hope
that they will ever be changed to do so (as that would destroy their
ability to read captures using that value for that other purpose).
<p>
Do <strong>NOT</strong> use any of these link-layer header type values
unless your link-layer headers <strong>EXACTLY</strong> match the
specification. If they do not exactly match, request a new
link-layer header type for them.
</p>
</div>
<!-- End of LINK-LAYER HEADER TYPES section -->
</div>
<!-- Start of LINK-LAYER HEADER TYPE VALUES section -->
<div class="post">
<h2 class="title">
Link-layer header type values
</h2>
<div class="entry">
<table class=linktypedlt>
<tr>
<th><code>LINKTYPE_</code> name</th>
<th><code>LINKTYPE_</code> value</th>
<th>Corresponding <code>DLT_</code> name</th>
<th>Description</th>
</tr>
<tr>
<td class="symbol">LINKTYPE_NULL</td>
<td class="number">0</td>
<td class="symbol">DLT_NULL</td>
<td>
<a href="linktypes/LINKTYPE_NULL.html">BSD loopback encapsulation</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_ETHERNET</td>
<td class="number">1</td>
<td class="symbol">DLT_EN10MB</td>
<td>
<a class=away href="https://ieeexplore.ieee.org/document/7428776/">IEEE
802.3</a> Ethernet (10Mb, 100Mb, 1000Mb, and up); the <code>10MB</code> in the
<code>DLT_</code> name is historical.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_EXP_ETHERNET</td>
<td class="number">2</td>
<td class="symbol">DLT_EN3MB</td>
<td>
Experimental Ethernet (3Mb).
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_AX25</td>
<td class="number">3</td>
<td class="symbol">DLT_AX25</td>
<td>
<a class=away href="https://www.ax25.net/AX25.2.2-Jul%2098-2.pdf">AX.25</a> packet,
with nothing preceding it.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_PRONET</td>
<td class="number">4</td>
<td class="symbol">DLT_PRONET</td>
<td>
Reserved for Proteon ProNET Token Ring.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_CHAOS</td>
<td class="number">5</td>
<td class="symbol">DLT_CHAOS</td>
<td>
Reserved for <a class=away
href="http://www.bitsavers.org/pdf/mit/ai/AIM-628_chaosnet.pdf">MIT
Chaosnet</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_IEEE802_5</td>
<td class="number">6</td>
<td class="symbol">DLT_IEEE802</td>
<td>
IEEE 802.5 Token Ring; the <code>IEEE802</code>, without <code>_5</code>,
in the <code>DLT_</code> name is historical.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_ARCNET_BSD</td>
<td class="number">7</td>
<td class="symbol">DLT_ARCNET</td>
<td>
Reserved for ARCNET Data Packets with BSD encapsulation.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_SLIP</td>
<td class="number">8</td>
<td class="symbol">DLT_SLIP</td>
<td>
<a href="linktypes/LINKTYPE_SLIP.html">SLIP, with a header giving packet
direction</a>
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_PPP</td>
<td class="number">9</td>
<td class="symbol">DLT_PPP</td>
<td>
PPP, as per
<a class=away href="https://www.rfc-editor.org/rfc/rfc1661.html">RFC 1661</a>
and
<a class=away href="https://www.rfc-editor.org/rfc/rfc1662.html">RFC 1662</a>; if
the first 2 bytes are <code>0xff</code> and <code>0x03</code>, it's PPP in HDLC-like
framing, with the PPP header following those two bytes, otherwise it's
PPP without framing, and the packet begins with the PPP header. The
data in the frame is not octet-stuffed or bit-stuffed.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_FDDI</td>
<td class="number">10</td>
<td class="symbol">DLT_FDDI</td>
<td>
FDDI, as specified by ANSI INCITS 239-1994.
</td>
</tr>
<tr>
<td class="symbol"></td>
<td class="number">32</td>
<td class="symbol">DLT_REDBACK_SMARTEDGE</td>
<td>
Redback SmartEdge 400/800.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_PPP_HDLC</td>
<td class="number">50</td>
<td class="symbol">DLT_PPP_SERIAL</td>
<td>
PPP in HDLC-like framing, as per
<a class=away href="https://www.rfc-editor.org/rfc/rfc1662.html"> RFC 1662</a>,
or Cisco PPP with HDLC
framing, as per <a class=away href="https://www.rfc-editor.org/rfc/rfc1547.html#section-4.3.1">
section 4.3.1 of RFC 1547</a>; the first byte will be <code>0xFF</code>
for PPP in HDLC-like framing, and will be <code>0x0F</code> or <code>0x8F</code> for Cisco PPP
with HDLC framing. The data in the frame is not octet-stuffed or
bit-stuffed.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_PPP_ETHER</td>
<td class="number">51</td>
<td class="symbol">DLT_PPP_ETHER</td>
<td>
PPPoE; the packet begins with a PPPoE header, as per
<a class=away href="https://www.rfc-editor.org/rfc/rfc2516.html">RFC 2516</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_SYMANTEC_FIREWALL</td>
<td class="number">99</td>
<td class="symbol">DLT_SYMANTEC_FIREWALL</td>
<td>
Symantec Enterprise (ex-Axent Raptor) firewall.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_ATM_RFC1483</td>
<td class="number">100</td>
<td class="symbol">DLT_ATM_RFC1483</td>
<td>
<a class=away href="https://www.rfc-editor.org/rfc/rfc1483.html">RFC 1483</a>
LLC/SNAP-encapsulated ATM; the packet begins with an
<a class=away href="https://www.iso.org/standard/30174.html">ISO 8802-2</a>
(formerly known as IEEE 802.2) LLC header.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_RAW</td>
<td class="number">101</td>
<td class="symbol">DLT_RAW</td>
<td>
Raw IP; the packet begins with an IPv4 or IPv6 header, with the
version field of the header indicating whether it's an IPv4 or IPv6
header.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_C_HDLC</td>
<td class="number">104</td>
<td class="symbol">DLT_C_HDLC</td>
<td>
Cisco PPP with HDLC framing, as per
<a class=away href="https://www.rfc-editor.org/rfc/rfc1547.html#section-4.3.1">
section 4.3.1 of RFC 1547</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_IEEE802_11</td>
<td class="number">105</td>
<td class="symbol">DLT_IEEE802_11</td>
<td>
<a class=away href="https://ieeexplore.ieee.org/document/7786995/">IEEE 802.11</a>
wireless LAN.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_ATM_CLIP</td>
<td class="number">106</td>
<td class="symbol">DLT_ATM_CLIP</td>
<td>
Linux Classical IP over ATM.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_FRELAY</td>
<td class="number">107</td>
<td class="symbol">DLT_FRELAY</td>
<td>
Frame Relay LAPF frames, beginning with a <a class=away
href="https://www.itu.int/rec/T-REC-Q.922/en/">ITU-T Recommendation
Q.922</a> LAPF header starting with the address field, and without an
FCS at the end of the frame.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_LOOP</td>
<td class="number">108</td>
<td class="symbol">DLT_LOOP</td>
<td>
<a href="linktypes/LINKTYPE_LOOP.html">OpenBSD loopback encapsulation</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_ENC</td>
<td class="number">109</td>
<td class="symbol">DLT_ENC</td>
<td>
Encapsulated packets for IPsec.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_NETBSD_HDLC</td>
<td class="number">112</td>
<td class="symbol">DLT_HDLC</td>
<td>
Cisco HDLC.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_LINUX_SLL</td>
<td class="number">113</td>
<td class="symbol">DLT_LINUX_SLL</td>
<td>
<a href="linktypes/LINKTYPE_LINUX_SLL.html">Linux "cooked" capture
encapsulation</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_LTALK</td>
<td class="number">114</td>
<td class="symbol">DLT_LTALK</td>
<td>
Apple LocalTalk; the packet begins with an AppleTalk LocalTalk Link
Access Protocol header, as described in chapter 1 of <a class=away
href="https://web.archive.org/web/20040719034527/http://developer.apple.com:80/macos/opentransport/docs/dev/Inside_AppleTalk.pdf">Inside
AppleTalk, Second Edition</a>.
</td>
</tr>
<tr>
<td class="symbol"></td>
<td class="number">115</td>
<td class="symbol">DLT_ECONET</td>
<td>
Acorn Econet.
</td>
</tr>
<tr>
<td class="symbol"></td>
<td class="number">116</td>
<td class="symbol">DLT_IPFILTER</td>
<td>
OpenBSD ipfilter.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_PFLOG</td>
<td class="number">117</td>
<td class="symbol">DLT_PFLOG</td>
<td>
OpenBSD pflog; the link-layer header contains a
<code>struct pfloghdr</code>
structure, as defined by the host on that the file was saved. (This
differs from operating system to operating system and release to
release; there is nothing in the file to indicate what the layout of
that structure is.)
</td>
</tr>
<tr>
<td class="symbol"></td>
<td class="number">118</td>
<td class="symbol">DLT_CISCO_IOS</td>
<td>
Cisco internal use.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_IEEE802_11_PRISM</td>
<td class="number">119</td>
<td class="symbol">DLT_PRISM_HEADER</td>
<td>
<a href="linktypes/LINKTYPE_IEEE802_11_PRISM.html">Prism monitor mode
information, followed by an 802.11 frame.</a>
</td>
</tr>
<tr>
<td class="symbol"></td>
<td class="number">120</td>
<td class="symbol">DLT_AIRONET_HEADER</td>
<td>
Reserved for Aironet 802.11 cards, with an Aironet link-layer header.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_IP_OVER_FC</td>
<td class="number">122</td>
<td class="symbol">DLT_IP_OVER_FC</td>
<td>
<a class=away href="https://www.rfc-editor.org/rfc/rfc2625.html">RFC 2625</a>
IP-over-Fibre Channel, with the link-layer header being the
Network_Header as described in that RFC.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_SUNATM</td>
<td class="number">123</td>
<td class="symbol">DLT_SUNATM</td>
<td>
<a href="linktypes/LINKTYPE_SUNATM.html">ATM traffic captured from a
SunATM device</a>.
</td>
</tr>
<tr>
<td class="symbol"></td>
<td class="number">124</td>
<td class="symbol">DLT_RIO</td>
<td>
RapidIO.
</td>
</tr>
<tr>
<td class="symbol"></td>
<td class="number">125</td>
<td class="symbol">DLT_PCI_EXP</td>
<td>
PCI Express.
</td>
</tr>
<tr>
<td class="symbol"></td>
<td class="number">126</td>
<td class="symbol">DLT_AURORA</td>
<td>
Xilinx Aurora.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_IEEE802_11_RADIOTAP</td>
<td class="number">127</td>
<td class="symbol">DLT_IEEE802_11_RADIO</td>
<td>
<a class=away href="https://www.radiotap.org/">Radiotap link-layer information</a>
followed by an 802.11 header.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_TZSP</td>
<td class="number">128</td>
<td class="symbol">DLT_TZSP</td>
<td>
Tazmen Sniffer Protocol (TZSP) is a generic encapsulation for any other link
type, which includes a means to include meta-information with the packet,
e.g. signal strength and channel for 802.11 packets.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_ARCNET_LINUX</td>
<td class="number">129</td>
<td class="symbol">DLT_ARCNET_LINUX</td>
<td>
Reserved for ARCNET Data Packets with Linux encapsulation.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_MLPPP</td>
<td class="number">130</td>
<td class="symbol">DLT_JUNIPER_MLPPP</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_MLFR</td>
<td class="number">131</td>
<td class="symbol">DLT_JUNIPER_MLFR</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_ES</td>
<td class="number">132</td>
<td class="symbol">DLT_JUNIPER_ES</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_GGSN</td>
<td class="number">133</td>
<td class="symbol">DLT_JUNIPER_GGSN</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_MFR</td>
<td class="number">134</td>
<td class="symbol">DLT_JUNIPER_MFR</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_ATM2</td>
<td class="number">135</td>
<td class="symbol">DLT_JUNIPER_ATM2</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_SERVICES</td>
<td class="number">136</td>
<td class="symbol">DLT_JUNIPER_SERVICES</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_ATM1</td>
<td class="number">137</td>
<td class="symbol">DLT_JUNIPER_ATM1</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_APPLE_IP_OVER_IEEE1394</td>
<td class="number">138</td>
<td class="symbol">DLT_APPLE_IP_OVER_IEEE1394</td>
<td>
<a href="linktypes/LINKTYPE_APPLE_IP_OVER_IEEE1394.html">Apple
IP-over-IEEE 1394 cooked header</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_MTP2_WITH_PHDR</td>
<td class="number">139</td>
<td class="symbol">DLT_MTP2_WITH_PHDR</td>
<td>
Signaling System 7 Message Transfer Part Level 2, as specified by <a class=away
href="https://www.itu.int/rec/T-REC-Q.703/en/">ITU-T Recommendation
Q.703</a>, preceded by a pseudo-header.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_MTP2</td>
<td class="number">140</td>
<td class="symbol">DLT_MTP2</td>
<td>
Signaling System 7 Message Transfer Part Level 2, as specified by <a class=away
href="https://www.itu.int/rec/T-REC-Q.703/en/">ITU-T Recommendation
Q.703</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_MTP3</td>
<td class="number">141</td>
<td class="symbol">DLT_MTP3</td>
<td>
Signaling System 7 Message Transfer Part Level 3, as specified by <a class=away
href="https://www.itu.int/rec/T-REC-Q.704/en/">ITU-T Recommendation
Q.704</a>, with no MTP2 header preceding the MTP3 packet.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_SCCP</td>
<td class="number">142</td>
<td class="symbol">DLT_SCCP</td>
<td>
Signaling System 7 Signalling Connection Control Part, as specified by
<a class=away href="https://www.itu.int/rec/T-REC-Q.711/en/">ITU-T Recommendation
Q.711</a>,
<a class=away href="https://www.itu.int/rec/T-REC-Q.712/en/">ITU-T Recommendation
Q.712</a>,
<a class=away href="https://www.itu.int/rec/T-REC-Q.713/en/">ITU-T Recommendation
Q.713</a>, and
<a class=away href="https://www.itu.int/rec/T-REC-Q.714/en/">ITU-T Recommendation
Q.714</a>, with no MTP3 or MTP2 headers preceding the SCCP packet.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_DOCSIS</td>
<td class="number">143</td>
<td class="symbol">DLT_DOCSIS</td>
<td>
DOCSIS MAC frames, as described by <a class=away
href="https://apps.cablelabs.com/specification/CM-SP-MULPIv4.0">the
DOCSIS 4.0 MAC and Upper Layer Protocols Interface Specification</a> or
earlier specifications for MAC frames.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_LINUX_IRDA</td>
<td class="number">144</td>
<td class="symbol">DLT_LINUX_IRDA</td>
<td>
<a href="linktypes/LINKTYPE_LINUX_IRDA.html">Linux-IrDA packets</a>
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_IBM_SP</td>
<td class="number">145</td>
<td class="symbol">DLT_IBM_SP</td>
<td>
IBM SP switch.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_IBM_SN</td>
<td class="number">146</td>
<td class="symbol">DLT_IBM_SN</td>
<td>
IBM Next Federation switch.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_USER0–LINKTYPE_USER15</td>
<td class="number">147–162</td>
<td class="symbol">DLT_USER0–DLT_USER15</td>
<td>
Reserved for private use; see above.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_IEEE802_11_AVS</td>
<td class="number">163</td>
<td class="symbol">DLT_IEEE802_11_RADIO_AVS</td>
<td>
<a class=away href="https://web.archive.org/web/20040803232023/http://www.shaftnet.org/~pizza/software/capturefrm.txt">AVS monitor mode
information</a> followed by an 802.11 header.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_MONITOR</td>
<td class="number">164</td>
<td class="symbol">DLT_JUNIPER_MONITOR</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_BACNET_MS_TP</td>
<td class="number">165</td>
<td class="symbol">DLT_BACNET_MS_TP</td>
<td>
BACnet MS/TP frames, as specified by section 9.3 <b>MS/TP Frame
Format</b> of
<a class=away
href="https://www.ashrae.org/technical-resources/bookstore/bacnet">ANSI/ASHRAE
Standard 135, BACnet® - A Data Communication Protocol for Building
Automation and Control Networks</a>, including the preamble and, if
present, the Data CRC.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_PPP_PPPD</td>
<td class="number">166</td>
<td class="symbol">DLT_PPP_PPPD</td>
<td>
PPP in HDLC-like encapsulation, like <code>LINKTYPE_PPP_HDLC</code>, but with the
<code>0xff</code> address byte replaced by a direction indication—<code>0x00</code>
for incoming and <code>0x01</code> for outgoing.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_PPPOE</td>
<td class="number">167</td>
<td class="symbol">DLT_JUNIPER_PPPOE</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_PPPOE_ATM</td>
<td class="number">168</td>
<td class="symbol">DLT_JUNIPER_PPPOE_ATM</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_GPRS_LLC</td>
<td class="number">169</td>
<td class="symbol">DLT_GPRS_LLC</td>
<td>
General Packet Radio Service Logical Link Control, as defined by <a class=away
href="https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=224">3GPP TS 04.64</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_GPF_T</td>
<td class="number">170</td>
<td class="symbol">DLT_GPF_T</td>
<td>
Transparent-mapped generic framing procedure, as specified by
<a class=away href="https://www.itu.int/rec/T-REC-G.7041/en">ITU-T
Recommendation G.7041/Y.1303</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_GPF_F</td>
<td class="number">171</td>
<td class="symbol">DLT_GPF_F</td>
<td>
Frame-mapped generic framing procedure, as specified by
<a class=away href="https://www.itu.int/rec/T-REC-G.7041/en">ITU-T
Recommendation G.7041/Y.1303</a>.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_GCOM_T1E1</td>
<td class="number">172</td>
<td class="symbol">DLT_GCOM_T1E1</td>
<td>
Gcom's T1/E1 line monitoring equipment.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_GCOM_SERIAL</td>
<td class="number">173</td>
<td class="symbol">DLT_GCOM_SERIAL</td>
<td>
Gcom's T1/E1 line monitoring equipment.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_JUNIPER_PIC_PEER</td>
<td class="number">174</td>
<td class="symbol">DLT_JUNIPER_PIC_PEER</td>
<td>
Juniper Networks private data link type.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_ERF_ETH</td>
<td class="number">175</td>
<td class="symbol">DLT_ERF_ETH</td>
<td>
An <a class=away href="https://www.endace.com/erf-extensible-record-format-types.pdf">ERF header</a>
followed by Ethernet.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_ERF_POS</td>
<td class="number">176</td>
<td class="symbol">DLT_ERF_POS</td>
<td>
An <a class=away href="https://www.endace.com/erf-extensible-record-format-types.pdf">ERF header</a>
followed by Packet-over-SONET.
</td>
</tr>
<tr>
<td class="symbol">LINKTYPE_LINUX_LAPD</td>
<td class="number">177</td>
<td class="symbol">DLT_LINUX_LAPD</td>
<td>
<a href="linktypes/LINKTYPE_LINUX_LAPD.html">Linux vISDN LAPD frames</a>
</td>
</tr>