Wireshark remove duplicate packets editcap

I have a capture with mutiple duplicate packets. The editcap -d command is not removing any of the packets. Does anyone know why this would occur? Editcap does not determine that packets are duplicates based on the IP ID. It uses a hash of the packet.

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So if two packets are between the same IP addresses and both have the same IP ID, but something else--something other than the IP ID--is different, editcap will not see them as duplicates. Also, editcap only looks within the duplicate window, which by default is 5, meaning the current packet and the previous four packets.

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So if packet 10 is a duplicate of packet 2, editcap won't see that because packet 2 is not within the four previous packets from packet You can change the size of the duplicate window.

You can also change it to be based on time rather than number of packets. Please start posting anonymously - your entry will be published after you log in or create a new account. First time here?

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wireshark remove duplicate packets editcap

Any reason why? Enter "editcap -h" to see all the options. Add Answer. Question Tools Follow. Powered by Askbot version 0. Ask Your Question.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I used editcap with option "-d" on a large pcapng file to delete duplicate packets source file 11GB, new file 5 GB. After that, i extracted all contained files from both pcapng-files with Networkminer free.

I assumed there would be no data loss.

wireshark remove duplicate packets editcap

Instead, as I compared the two extraction folders AssembledFilesI found out that about 30 files were missing in one of them. How is this to explain? Why should deleting duplicate packets result in data loss? Then I got editcap v 2. Copyright Gerald Combs and contributors.

Learn more. Ask Question. Asked 1 year, 11 months ago. Active 1 year, 11 months ago. Viewed times. Editcap Wireshark 2. Compiled bit with GLib 2.

editcap (1) - Linux Man Pages

Improve this question. Tex Tex 19 4 4 bronze badges. Sounds like a great question to ask on the WIreshark support forum.

What version of editcap are you running i. Perhaps there's a bug and updating Wireshark and its suite of tools to a newer version might help. If you can reproduce this problem with a subset of packets, you can try opening a Wireshark bug report at bugs.

David Hoelzer I am new to packet sniffing and I have just learned why there are possibly duplicated packets in a capture file. I honestly did not expect it could be a bug. I just wanted to assure, there are no known scenarios where data loss can occur on deleting duplicates.Duplicate Packets Duplicate packets are an often observed network behaviour. A packet is duplicated somewhere on the network and received twice at the receiving host.

It is very often not desireable to get these duplicates, as the receiving application might think that's "fresh" data which it isn't. If a sending host thinks a packet is not transmitted correctly because of a PacketLossit might Retransmit that packet.

The receiving host might already got the first packet, and will receive a second one, which is a duplicated packet. ConnectionOrientedProtocols such as TCP will detect duplicate packets, and will ignore them completely. ConnectionlessProtocols such as UDP won't detect duplicate packets, because there's no information in, for example, the UDP header to identify a packet so that packets can be recognized as duplicates. The data from that packet will be indicated twice or even more to the application; it's the responsibility of the application to detect duplicates perhaps by supplying enough information in its headers to do so and process them appropriately, if necessary.

Reasons For most networks, duplicate packets is a typical behaviour, e.

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Troubleshooting If the network is configured correctly, there's not much that can be done against duplicate packets as this is a somewhat "intended" behaviour. Discussion Q: Is it possible to turn off the display of duplicate packets? I must decode the traffic of the systems now, before the network engineers have had time to flush out the congestion causes. A: Try using not tcp. Please use that site instead. See the License page for details. Powered by MoinMoin and Python.

Please don't pee in the pool.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I would like to know if there is any way command line option using which I can discard duplicate packets and make new pcap with all unique packets.

You can use editcap which is part of the Wireshark package with the -d flag. Learn more. Removing duplicate packets from pcap Ask Question. Asked 7 years, 3 months ago. Active 7 years, 2 months ago. Viewed 4k times.

I want to analyze packet capture file, but it has some duplicate packets. For e. So the goal is to remove duplicate packets which are in count.

wireshark remove duplicate packets editcap

I am using latest wireshark version 1. Improve this question. Active Oldest Votes. Improve this answer. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.

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Visual design changes to the review queues. Related 0. Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled.Editcap is a program that reads some or all of the captured packets from the infileoptionally converts them in various ways and writes the resulting packets to the capture outfile or outfiles.

By default, it reads all packets from the infile and writes them to the outfile in pcapng file format. By default the selected packets with those numbers will not be written to the capture file. If the -r flag is specified, the whole packet selection is reversed; in that case only the selected packets will be written to the capture file. Editcap can also be used to remove duplicate packets.

Several different options -d-D and -w are used to control the packet window or relative time window to be used for duplicate comparison. Editcap is able to detect, read and write the same capture files that are supported by Wireshark.

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The input file doesn't need a specific filename extension; the file format and an optional gzip compression will be automatically detected. Editcap can write the file in several output formats.

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The -F flag can be used to specify the format in which to write the capture file; editcap -F provides a list of the available output formats. For the specifiqed frame number, assign the given comment string. Can be repeated for multiple frames. Quotes should be used with comment strings that include spaces. Saves only the packets whose timestamp is on or after start time.

Saves only the packets whose timestamp is before stop time. Each output file will be created with a suffix -nnnnn, starting with If the specified number of packets is written to the output file, the next output file is opened. The default is to use a single output file.

Sets the chop length to use when writing the packet data. Positive values chop at the packet beginning while negative values chop at the packet end. Positive offsets are from the packet beginning, while negative offsets are from the packet end. This is useful for chopping headers for decapsulation of an entire capture, removing tunneling headers, or in the rare case that the conversion between two file formats leaves some random bytes at the end of each packet.

Another use is for removing vlan tags. NOTE: This option can be used more than once, effectively allowing you to chop bytes from up to two different areas of a packet in a single pass provided that you specify at least one chop length as a positive value and at least one as a negative value.

All positive chop lengths are added together as are all negative chop lengths. Attempts to remove duplicate packets.We have traces which contain duplicate packets.

We clear them with editcap. However some of them include the same frame instance with a VLAN tag and without. Since those 2 are considered different one of them is not removed. Is there a way to do this? If all VLAN tagged frame are duplicates only that just filter these away.

But it's probably not that simple As of yet there's no way to do that within Wireshark or its tools. You may have luck with other tools, maybe trace wrangler. I thought it could when reading the documentation? Unfortunatelly not. It looks like tcpdump in linux captures and stores frames, 1. So I'm looking to see if editcap has the ability to compare all other frame data except the VLAN tag and if they match then remove either one Not sure I can find this option in editcap or wireshark in general.

The editcap guide does not even include the word vlan. Any ideas? See the FAQ of this site. Jasper : Think of it in the Unix way, use one tool for one specific job. So use trace wrangler to strip out the VLAN headers, then the new file will have the duplicates that editcap can go over and deduplicate.

News: I can only find a windows based version of TraceWrangler.

wireshark remove duplicate packets editcap

Both 32 and 64 bit versions crash while working on the imported traces and also corrupt the frames during the process. When I run SuperDeduper I get the msg that it's not a valid windows application. Cannot find any info in the web about this application.

Should I run it in linux of somekind? Answers and Comments.By default, it reads all packets from the infile and writes them to the outfile in pcapng file format.

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By default the selected packets with those numbers will not be written to the capture file. If the -r flag is specified, the whole packet selection is reversed; in that case only the selected packets will be written to the capture file. Editcap can also be used to remove duplicate packets. Several different options -d-D and -w are used to control the packet window or relative time window to be used for duplicate comparison.

Editcap is able to detect, read and write the same capture files that are supported by Wireshark. The input file doesn't need a specific filename extension; the file format and an optional gzip compression will be automatically detected.

Editcap can write the file in several output formats. The -F flag can be used to specify the format in which to write the capture file; editcap -F provides a list of the available output formats.

Positive offsets are from the packet beginning, while negative offsets are from the packet end. This is useful for chopping headers for decapsulation of an entire capture, removing tunneling headers, or in the rare case that the conversion between two file formats leaves some random bytes at the end of each packet.

Another use is for removing vlan tags. NOTE: This option can be used more than once, effectively allowing you to chop bytes from up to two different areas of a packet in a single pass provided that you specify at least one chop length as a positive value and at least one as a negative value.

All positive chop lengths are added together as are all negative chop lengths.

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The use of the option -D 0 combined with the -v option is useful in that each packet's Packet number, Len and MD5 Hash will be printed to standard out. This verbose output specifically the MD5 hash strings can be useful in scripts to identify duplicate packets across trace files. This may be useful if the program that is to read the output file cannot handle packets larger than a certain size for example, the versions of snoop in Solaris 2. This feature is useful when the trace file has an occasional packet with a negative delta time relative to the previous packet.

Duplicate Packets

This feature is useful when synchronizing dumps collected on different machines where the time difference between the two machines is known or can be estimated. Note: this merely forces the encapsulation type of the output file to be the specified type; the packet headers of the packets will not be translated from the encapsulation type of the input capture file to the specified encapsulation type for example, it will not translate an Ethernet capture to an FDDI capture if an Ethernet capture is read and ' -T fddi ' is specified.

Use of -v with the de-duplication switches of -d-D or -w will cause all MD5 hashes to be printed whether the packet is skipped or not.


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