Hi Alan,
I've never experience that error. But as I mentioned before, I patched
the UDP code path, so I might have fix this bug. Also, there is two
interesting things in your capture:
- in the first packet (UDP), the compressed UDP header is followed by
the uncompressed header
- in the second packet (ICMP error message), the copy of the original
packet that triggered the error omit the compressed UDP header.
Also, it shows the packet the way it has been decoded
internally; the next header and the payload length field do not
seem to match
Regards,
Tony
Le Sat, 04 Aug 2012 12:43:43 -0400,
Alan Ott <a...@signal11.us> a écrit :
> On 08/03/2012 07:25 PM, Tony Cheneau wrote:
> >>> - UDP header compression is broken: the header is compressed
> >>> correctly, however both compressed and uncompressed header are
> >>> sent on the air. Because the code is broken on the sender and the
> >>> receiver, it still works. I have a patch for that (saves a few
> >>> bytes in the packet).
> >>>
>
> Hi Tony,
>
> As far as UDP goes, I made a simple UDP client/server to see if I can
> get one packet across the link that wasn't ICMP6.
>
> The packet[1] is sent and looks good in wireshark, but the receiver
> bounces it back with an ICMP6 packet which Wireshark dissects as
> saying "Parameter Problem, unrecognized next header encountered."
> That seems different than the UDP issue you described. Is this
> something you've seen before?
>
> Alan.
>
> [1] http://www.signal11.us/~alan/next-header.pcap.gz
>
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