Wireshark-users: Re: [Wireshark-users] The capturefile appears to be damaged or corrupt. (pcap: F
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From: "Gianluca Varenni" <gianluca.varenni@xxxxxxxxxxxx>
Date: Mon, 17 May 2010 11:07:17 -0700
It's my understanding that dumpcap uses its own custom code to create PCAP files. The only case that might cause a corrupted capture file is that when a packet is received with pcap_next_ex (or whatever other function is used by dumpcap), pcap_pkthdr::len < pcap_pkthdr::caplen, and even in this case, I'm not sure if this would cause a corrupted file. 

Have a nice day
GV

--------------------------------------------------
From: "Sake Blok" <sake@xxxxxxxxxx>
Sent: Monday, May 17, 2010 10:44 AM
To: "Community support list for Wireshark" <wireshark-users@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-users] The capturefile	appears	to	be	damaged	orcorrupt.(pcap: Fileshas	109736-byte packet, bigger than maximum of 65535)


Hi Joseph,
If you look at the last packet of the tracefile that can be read by Wireshark (frame 1407), you can see that the capture length is set to 98 bytes, while there were 102 bytes on the wire. However, you were not using a snap length and the tracefile actually contains all 102 bytes. This looks like a bug in WinPcap. Which version of WinPcap are you using? I'm not sure but I believe there were some issues with earlier 64 bit versions of WinPcap. 

Cheers,


Sake

On 17 mei 2010, at 16:25, Joseph Laibach wrote:


Here is one of the files that loads and tells me the file is corrupt.

-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Joseph Laibach 
Sent: Friday, May 14, 2010 3:32 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] The capture file appears to be damaged or corrupt. (pcap: Files has 109736-byte packet, bigger than maximum of 65535)
So I made the changes and once the network traffic starts picking up I get corrupted files again. Traffic is about 60MBit/sec. 

Here is the command I'm running now:
C:\"Program Files"\Wireshark\dumpcap.exe -i \Device\NPF_{21741AFC-E45E-46A6-9740-9E233E4FF91D} -w d:\SFTI_capture -b files:20000 -b filesize:8192 -B 256 

Thanks again

Joe

-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Joseph Laibach 
Sent: Friday, May 14, 2010 11:47 AM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] The capture file appears to be damaged or corrupt. (pcap: Files has 109736-byte packet, bigger than maximum of 65535)
Thanks for catching it. I should be using the -b filesize:8192 instead. I'll make the changes and see what happens. 

Thanks

Joe

-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Sake Blok 
Sent: Friday, May 14, 2010 11:36 AM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] The capture file appears to be damaged or corrupt. (pcap: Files has 109736-byte packet, bigger than maximum of 65535) 

Hmmm... reading back all the mails I see that you use:

dumpcap ... -b files:10000 -a filesize:8192 ...
Why are you mixing -b and -a options? "-a" options are for automatic finishing the capturing and "-b" options are for creating a ringbuffer. Which of the two were you planning to use?
If sticking to one of these two options does not solve the issue, are you able to share a file that is giving the error? 

Cheers,
Sake



On 14 mei 2010, at 17:11, Joseph Laibach wrote:
I open the file on the host that is was captured on, or I copy it via a Windows file share. Either way it gives me the same error. I'm capturing stock Market multicast data, if that matters. The traffic is very bursty and the data rate is around 200mb/sec. I switched from a Broadcom NIC to Intel NIC to see if that would help but no luck on that change either. 

-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Sake Blok 
Sent: Friday, May 14, 2010 10:49 AM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] The capture file appears to be damaged or corrupt. (pcap: Files has 109736-byte packet, bigger than maximum of 65535)
Did you open the file on the host on which it was captured? Or did you transfer the file from the capturing host to the host on which you try to read it? The error message that you get usually appears after the file has been transferred to another host with FTP in ASCII mode instead of BINARY mode.
(FYI dumpcap writes libpcap based files which can not contain packets larger than 65535 bytes, so the file is most probably corrupted somehow) 

Cheers,
Sake

On 14 mei 2010, at 16:36, Joseph Laibach wrote:
Is there a way to remove the 65535 maximum from the reading of a capture? 

Thanks

Joe

-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Joseph Laibach 
Sent: Tuesday, May 11, 2010 11:36 AM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] The capture file appears to be damaged or corrupt. (pcap: Files has 109736-byte packet, bigger than maximum of 65535) 

I'm running version 1.2.7 64bit.

-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Jaap Keuter 
Sent: Tuesday, May 11, 2010 11:29 AM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] The capture file appears to be damaged or corrupt. (pcap: Files has 109736-byte packet, bigger than maximum of 65535) 

But what release of Wireshark are you using?

Thanks,
Jaap

Send from my iPhone
On 11 mei 2010, at 16:37, Joseph Laibach <jlaibach@xxxxxxxxxxxxx> wrote: 


I am having an issue with some of the capture files. Some captures
files spit back an error that the capture file appears to be damaged
or corrupt. The capture is running on a Windows 2003 Sever R2 64bit,
with 2 gigs of memory and a Inetl Xeon 2.33ghz processor.



I am capturing with dumpcap. The syntax I am using is as follows: C:
\"Program Files"\Wireshark\dumpcap.exe -i \Device\NPF_
{ECC9D35A-826A-4A4F-B634-656EAD4EC7C9} -w d:\SFTI_capture -b files:
10000 -a filesize:8192 -B 128 -s 10000000



I added the -s 10000000 to try and fix the large byte packet issue b
ut that hasn't worked.



Anyone have any suggestions on how to eliminated the corruption of
capture files?



Thanks



Joe Laibach




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