Wireshark-users: [Wireshark-users] TPKT-Wrapping of H.248 Messages
From: "Umut Emin" <[email protected]>
Date: Fri, 27 Jun 2008 12:17:49 +0200 (CEST)

i have the following question:

if i send a h.248 message (over TCP) wrapped with tpkt header, wireshark doesn't recognize
the h.248 transfer. It shows me a package of TPKT protocol with info "Continuation"
which is fine. As i want to see what is in the package it doesn't form an expected
structure like:
TPKT: version:3 length:1024

It shows the h.248 message as a raw "Data".

Now my application creates a TPKT header as explained in RFC 1006 which means:

version no = 3  (1 byte)
reserved = 0x01 (1 byte)
message length = 1024 (2 bytes) [including the tpkt header]

and these values are added as 4 bytes in the beginning of the send buffer. Now i wonder
if wireshark is not able to work with tpkt on h.248 yet?

For clarity, i included a dump from the wire (see package no:4) as attachment.

Thanx in advance.

Attachment: tpkt_h248_wrapping.pcap
Description: tpkt_h248_wrapping.pcap