Guy Harris wrote:
On Mon, Mar 22, 2004 at 06:13:45PM -0600, Jim Harvey wrote:
I'm assuming Clay is decoding a SONET DCC channel through the OmniBer
high speed serial port.
Then he needs to read the packets himself and write them in a format
that Ethereal can interpret appropriately - there's no libpcap format
for ISDN or LAPD (the two are inequivalent - a LAPD capture would be a
capture of only LAPD packets, while an ISDN capture would be D-channel
and B-channel traffic, with each packet having a channel number).
For What It's Worth, Ethereal has no problem
decoding the LAPD under CLNP that comes out the back of a Fujitsu
multiplexer on it's 10baseT jack.
How exactly does Ethereal decide to call the LAPD dissector in that
case? The only place where it's currently called is the ISDN dissector,
which calls it for D-channel traffic.
You are correct. I looked at some of the capture files from the LAN
port. They have LLC1 at layer 2. LAPD at layer 2 is only seen on the
stack that runs on the optical line. Layer 3 is CLNP in both cases, with
TP4 on top of that.
We had Agilent look at this problem once with their Agilent Advisor. It
did the same thing as Ethereal, decided the packets were ISDN and would
not decode any farther.
--
Jim Harvey - Network Solutions Testing
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