Wireshark · Wireshark-users: Re: [Wireshark-users] Wireshark not reassembling UDP packet

[Andre Kostur <akostur@xxxxxxxxxxxxx>]

That did it.  Disabling "Validate the IPv4 checksum if possible" caused Wireshark to reassemble the packet.

Sake, did you still want the capture of the three packets?   How would you like it delivered?  Attached to a post to the list?  (Will the list allow attachments?  It's about 10kb over 6 packets.  The AS-REQ which does get reassembled, and the AS-REP which does not.)

On Tue, Apr 24, 2012 at 12:22, Michael Tuexen <Michael.Tuexen@xxxxxxxxxxxxxxxxx> wrote:

On Apr 24, 2012, at 8:36 PM, Sake Blok wrote:

> On 24 apr 2012, at 17:42, Andre Kostur wrote:
>
>> Yep, Frame length and Capture length are 1514 bytes.  UDP checksum validation is already disabled.  Additional information, the capture was done on the same box as the packet transmitter.   Doing the capture from a 3rd box, and wireshark is able to reassemble the packet.
>
> It should also work on the box itself. Are you able to post the capture file so we can have a look at why it is failing?

UDP doesn't do fragmentation and reassembly. So I guess you need IP level reassembly. One possibility
is that the IP header checksum is not correct due to offloading. Does trying to disable the IP header checksum
validation help?

Best regards
Michael

>
> Cheers,
> Sake
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Andre Kostur Senior Product Design Engineer P: 604-678-2864 E: akostur@xxxxxxxxxxxxx Toll-Free: 1-800-877-1856	F: 604-678-2864 VoIP: sip:864@xxxxxxxxxxxxxxxxx