[Udpcast] updcast packet capture issue

Jayen jayenashar at gmail.com
Sun Oct 6 01:27:33 CEST 2013


is it over Wi-Fi? There may be retransmissions, but they haven't caused me
any issues.
On Oct 6, 2013 10:06 AM, "Chris Healy" <cphealy at gmail.com> wrote:

> Jayen,
>
> Thank you.  You were correct.  I no longer have this problem.  I also
> deduced that there is a sequence number in the multicast frame.
>
> I'm digging into this utility as I currently have a scenario where I get a
> bunch of duplicate frames hitting the udp-receiver (network issue, not
> application issue) and the application does not gracefully handle it.  I
> figured that the application did not have a sequence number.  As it does,
> there must be some other problem.  More to come.
>
> Chris
>
>
> On Sat, Oct 5, 2013 at 3:55 PM, Jayen <jayenashar at gmail.com> wrote:
>
>> I believe wireshark is trying to decode it as a different protocol which
>> encapsulates IP in UDP.  Try disabling it.
>> On Oct 6, 2013 6:02 AM, "Chris Healy" <cphealy at gmail.com> wrote:
>>
>>>  Alain,
>>>
>>> I'm trying to perform a packet capture of the data transmitted by
>>> udp-sender using Wireshark and am running into the exact same problem
>>> encountered by Lance 8 years ago.  (posting listed below.)
>>>
>>> What information can I provide to help debug this issue?
>>>
>>> Also, can you tell me if the multicast data sent includes a sequence
>>> number and does the receiver have the ability to filter out duplicate
>>> multicast frames?
>>>
>>> Regards,
>>>
>>> Chris
>>>
>>>
>>>
>>> On Mon 8/15/2005 10:25 AM, Alain Knaff wrote:
>>> >*Try upgrading to a newer version of ethereal.*>**>*I just tried it
>>> here: version 0.10.9 has the problem, but 0.10.12*>*works fine.*>**>*Or use
>>> tcpdump...*
>>>
>>> I have used the lattest version of udpcast (udpcast-20050226.tar.gz)
>>> as well as used ethereal version 0.10.12 and
>>> I still get the "Bogus IP header length (0, must be at least 20)" I
>>> will continue to try this on different Platforms with different
>>> network switches and see what I get.
>>>
>>> -Lance
>>> _______________________________________________
>>> Udpcast mailing list
>>> Udpcast at udpcast.linux.lu
>>> https://www.udpcast.linux.lu/cgi-bin/mailman/listinfo/udpcast
>>>
>>
>



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