hello guy,
the link format from the omniber is really lapd (sonet section dcc). the
driver from the card manufacturer does not support native lapd on layer
2; the card is currently setup as cisco-hdlc. packet-isis.c has been
modified to register the isis protocol by name and all is well:
1 0.000000 Network -> User LAPD S, func=RR, N(R)=59
2 9.231336 Network -> User ISIS P2P HELLO, System-ID:
00e0.004f.af21
3 9.991451 Network -> User LAPD S, func=RR, N(R)=60
4 10.431185 Network -> User LAPD S, func=RR, N(R)=61
5 10.437877
[39|84:0f][80|00:00:00|00:00][00:00|00:00]00e0.004f.af21[1d] ->
[39|84:0f][80|00:00:00|00:00][00:00|00:00]0000.0e64.925c[1d] COTP CC
TPDU src-ref: 0x1401 dst-ref: 0x1401
6 10.450576 Network -> User LAPD S, func=RR, N(R)=62
7 10.458710 Network -> User LAPD S, func=RR, N(R)=63
8 10.467170
[39|84:0f][80|00:00:00|00:00][00:00|00:00]00e0.004f.af21[1d] ->
[39|84:0f][80|00:00:00|00:00][00:00|00:00]0000.0e64.925c[1d] COTP AK
TPDU (1) dst-ref: 0x1401
9 10.546747
[39|84:0f][80|00:00:00|00:00][00:00|00:00]00e0.004f.af21[1d] ->
[39|84:0f][80|00:00:00|00:00][00:00|00:00]0000.0e64.925c[1d] ACSE
10 10.562910 Network -> User LAPD S, func=RR, N(R)=64
11 10.631883 Network -> User LAPD S, func=RR, N(R)=65
12 10.639348
[39|84:0f][80|00:00:00|00:00][00:00|00:00]00e0.004f.af21[1d] ->
[39|84:0f][80|00:00:00|00:00][00:00|00:00]0000.0e64.925c[1d] COTP AK
TPDU (2) dst-ref: 0x1401
13 10.899767
[39|84:0f][80|00:00:00|00:00][00:00|00:00]00e0.004f.af21[1d] ->
[39|84:0f][80|00:00:00|00:00][00:00|00:00]0000.0e64.925c[1d] PRES Data
transfer PDU
14 10.914565 Network -> User LAPD S, func=RR, N(R)=66
15 11.033555
[39|84:0f][80|00:00:00|00:00][00:00|00:00]00e0.004f.af21[1d] ->
[39|84:0f][80|00:00:00|00:00][00:00|00:00]0000.0e64.925c[1d] PRES Data
transfer PDU
16 11.048487 Network -> User LAPD S, func=RR, N(R)=67
17 13.989504 Network -> User LAPD S, func=RR, N(R)=68
18 14.228583 Network -> User ESIS IS HELLO
19 20.496730 Network -> User LAPD S, func=RR, N(R)=69
thank you,
clay
Guy Harris wrote:
clay wispell wrote:
i am capturing and decoding data from an agilent omniber captured
from a microgate synclink card. packet-lapd.c has been modified so
that the incoming data is decoded as lapd (native cisco-hdlc on layer 2)
So what's the *actual* link-layer format on the wire? Is it really
LAPD, or is it Cisco HDLC, or is it something else?
and so that any information packets are decoded based on the nlpid of
the packet. clnp and esis work well (nlpid 0x81 and 0x82), however,
isis (nlpid 0x83) causes a segmentation fault. it appears that the
culprit is a null value returned here in packet-lapd.c
isis_handle = find_dissector("isis");
The ISIS dissector doesn't register itself by name, so the
"find_dissector()" call fails.
If you want to dissect the packet based on the NLPID, you should
probably make "dissect_osi()" (in packet-osi.c) register itself by
name, and call *that* dissector, so that it'll do all the work for you
(handling not only ISIS, but CLNP and ESIS).
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