Wireshark · Wireshark-dev: Re: [Wireshark-dev] Unable to recognise DTLS packets

[Tulika Bose <tulika.bose@xxxxxxx>]

Hi

  I used the command 'tshark -r "dtls_pcap.pcapng" -R "dtls" > dtls.txt' , for redirecting the informations of the packets diplayed in the pcap file dtls_pcap.pcapng into the text file dtls.txt. But,although the pcap file contained dtls packets,displayed when the 'Decode As' option was manually used, but the text file was blank,when filter used was "dtls".On the other hand ,when the filter used in the above command was "coap",the text file conatained packets,whose header was parsed as CoAP header,instead of dtls header. Please let me know how can I display dtls packets,with headers parsed as DTLS header using tshark in the command line.


Thanks & Regards
Tulika Bose
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-----wireshark-dev-bounces@xxxxxxxxxxxxx wrote: -----

To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
From: Pascal Quantin
Sent by: wireshark-dev-bounces@xxxxxxxxxxxxx
Date: 02/13/2014 01:37PM
Subject: Re: [Wireshark-dev] Unable to recognise DTLS packets

Hi,

2014-02-13 8:43 GMT+01:00 Tulika Bose <tulika.bose@xxxxxxx>:

Hi

  Thanx a lot.I used the 'Decode as' option,and the DTLS header is getting parsed correctly.But it caused an issue,that for some some of the DTLS packets,the pprotocol field showed DTLSv1,while the other packets showed it as DTLS,although all the packets are of the same version.Is there any particular reason for such a difference in version.

  Secondly,I would like to get the packet displayed with the header information,through command line using tshark,and redirect the output to a text file.But when the filter string used is 'dtls',the file conatains no entries.On the other hand,when the filter string used with the same command is 'coap',packets get displayed,but then again the DTLS header is parsed as CoAP.I would like to get DTLS packets decoded as DTLS through command line.I am using version 10.4.Is there any other approach to do the same using the same version,or I need to update it?

tshark -d option is your friend. See http://www.wireshark.org/docs/man-pages/tshark.html for details.

Pascal.
 

-----Hauke Mehrtens <hauke@xxxxxxxxxx> wrote: -----

To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>, tulika.bose@xxxxxxx
From: Hauke Mehrtens <hauke@xxxxxxxxxx>
Date: 02/12/2014 06:02PM
Subject: Re: [Wireshark-dev] Unable to recognise DTLS packets

On 02/12/2014 01:02 PM, Tulika Bose wrote:
> Dear All,
>    I have come across a problem with the display filter of dtls.The
> version I am using is 1.10.4.I have some DTLS packets,where DTLS is used
> over CoAP,and they have been captured in a .pcapng file. But when I
> filter the packets using the string 'dtls',no packets get displayed.On
> the other hand,when the filter string used is 'coap' or 'udp', packets
> get displayed,because DTLS is using the same port as coap which is
> 5683.But the problem is that the wireshark cannot recognise the DTLS
> header,it parses the same as the CoAP header,although these are actually
> dtls packets.It would be very kind of you,if you help  me with the issue.
>
> Thanks & Regards
> Tulika Bose

Port 5683 is the default CoAP port and then the CoAP dissector is used
by default. You can right click on the Package in wireshark and then
click on "Decode As..." and select DTLS to decode it was DTLS.

Wen you want to use DTLS with CoAP I would suggest you to use a nightly
build or a 11.X version of wireshark, there are some improvements in
wireshark regarding these two protocols.

Hauke

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