Ethereal-dev: Re: [Ethereal-dev] ASN.1 over SCTP

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From: Michael Tuexen <[email protected]>
Date: Wed, 28 Jul 2004 18:28:57 +0200

as pointed by others it is pretty easy to get your dissector called.
But there is possibly another problem: do your ASN.1 messages fit
in a DATA chunk or are you using the segmentation/reassembly feature
of SCTP. Reassembly of SCTP chunks is not yet build in.

For getting your protocol detected the best way is to use the PPID,
I think.

Best regards

On Jul 27, 2004, at 5:05 PM, Thomas Steffen wrote:


I am trying to use ethereal 0.10.5 for debugging a network application. We use a custom protocol (in ASN.1) over SCTP. It nearly works, but there are three outstanding issues:
1. I can't get ethereal to analyse the data sent over SCTP (beyond 
giving a hex dump). If I send the same date over TCP, I can use 
Decode-as->Transport and select ASN1. However, for an SCTP stream, the 
Transport tab is not show. I guess this is a simple issue, but I don't 
know where to look for it.
2. Is it possible to make ethereal recognise the ASN1 data 
3. Is it possble to autodetect the PDU type? We have several different 
message types, and they are defined as separate ASN.1 types.
Any suggestion would be very much appreciated. If changes to the code 
are necessary, I should be able to do that, if someone could point me 
into the correct direction...

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