Ethereal-users: RE: [Ethereal-users] "TCP Segment of a Reassembled PDU"vs. "Continuation or non-
Excellent explanation!
I run Ethereal from two different machines, and I just checked: The
"reassembly" preferences you reference are set differently across the
two.
Thanx,
Michael
Michael Feeny
I2T - Application Integration Management
609-274-2761 (Office)
484-995-1745 (Mobile)
feenyman99 (AIM)
-----Original Message-----
From: ethereal-users-bounces@xxxxxxxxxxxx
[mailto:ethereal-users-bounces@xxxxxxxxxxxx] On Behalf Of Guy Harris
Sent: Tuesday, April 18, 2006 1:52 PM
To: Ethereal user support
Subject: Re: [Ethereal-users] "TCP Segment of a Reassembled PDU"vs.
"Continuation or non-HTTP traffic"
Feeny, Michael (TD&DS, Applications Infrastructure Svcs.) wrote:
> I have 2 different trace files, each of which contains an HTTP "POST"
> request that is split across 2 packets. In one of the traces,
Ethereal
> displays "TCP Segment of a Reassembled PDU" for the 1^st of these 2
> packets, and in the other, it displays "Continuation or non-HTTP
> traffic" for the 2^nd of the 2 packets.
>
> Can someone explain the distinction?
"TCP Segment of a Reassembled PDU" means that Ethereal's doing
reassembly, which means that
1) TCP's "Allow subdissector to reassemble TCP streams"
preference is
turned on;
2) HTTP's reassembly preferences are turned on;
3) the POST body is either not split across segments or has a
Content-Length header (currently, HTTP bodies aren't reassembled if they
don't have a Content-Length header).
"Continuation or non-HTTP traffic means Ethereal's not doing reassembly.
Unless you changed the preference settings between the two traces, it
might be that the second POST doesn't have a Content-Length header.
> One difference in the 2 traces: In the first trace, HTTP is sent over
a
> non-standard TCP port (3139), and so I have to use "Analyze/Decode
as..."
> to force Ethereal to interpret the traffic as HTTP. Does that explain
> the difference in diagnostic messages?
Probably not - the HTTP code path should work the same in either case.
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