Re: merge pcap from two interfaces

["Maynard, Chris" <Christopher.Maynard () IGT com>]

Neither dumpcap nor tshark support on-the-fly compression (yet)[1], so unfortunately you’ll have to somehow solve that 
problem yourself.

As for the timestamp, the format is fixed so if you want to change it, you’ll have to come up with your own solution 
here too.

- Chris
[1]: https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=9311


From: luke devon [mailto:luke_devon () yahoo com]
Sent: Sunday, May 13, 2018 6:00 AM
To: Community support list for Wireshark <wireshark-users () wireshark org>; Maynard, Chris <Christopher.Maynard () IGT 
com>
Subject: Re: [Wireshark-users] merge pcap from two interfaces

Hi Chris,

I was able to execute the following command. syntaxes are same for the tshark and dumpcap.

dumpcap -i enp0s3 -i enp0s8 -b duration:15 -w /usr/etc/enp0s3_enp0s8.pcap

output as follows;

enp0s3_enp0s8_00001_20180513174130.pcap
enp0s3_enp0s8_00002_20180513174145.pcap

every 15sec, the file name is rolling out.

1. Can you please guide me, how to make the file compressed? for example; enp0s3_enp0s8_00001_20180513174130.tar.gz
2. also can I change the format of the timestamp in the file name?  Something similar to this --> 
trace_%Y-%m-%d_%H-%M-%S.pcap


I was using following tcpdump command to capture, adding the timestamp and compressing the traces.

tcpdump -i eno2 -s 0 -G 15 -w '/test/Network_%Y-%m-%d_%H-%M-%S.pcap' -Z root -z gzip

But I cant use this command continuously as it has limitations to capture multiple interface same time in a single 
command.

Thanks & Regards
Luke.



On Sunday, 13 May 2018, 10:48:28 AM GMT+8, luke devon via Wireshark-users <wireshark-users () wireshark 
org<mailto:wireshark-users () wireshark org>> wrote:


Hi Chris,

Thank you so much for the guidance.

May I know, can we use tshark to rotate the traces every 15 sec? and can we compress into tar.gz the completed dump?

Regards
Luke

On Sunday, 13 May 2018, 1:08:32 AM GMT+8, Maynard, Chris <Christopher.Maynard () IGT com<mailto:Christopher.Maynard () 
IGT com>> wrote:



Do you have to use tcpdump?  If you have tshark available, then you can capture on both interfaces at the same time 
without the need to merge separate capture files at all.  For example:



tshark -i eth0 -i eth1 –w eth0_eth1.pcapng



Refer to the tshark[1] (or dumpcap[2]) man pages for more information.

- Chris

[1]: https://www.wireshark.org/docs/man-pages/tshark.html

[2]: https://www.wireshark.org/docs/man-pages/dumpcap.html





From: Wireshark-users [mailto:wireshark-users-bounces () wireshark org] On Behalf Of luke devon via Wireshark-users
Sent: Saturday, May 12, 2018 8:17 AM
To: Community support list for Wireshark <wireshark-users () wireshark org<mailto:wireshark-users () wireshark org>>
Cc: luke devon <luke_devon () yahoo com<mailto:luke_devon () yahoo com>>
Subject: Re: [Wireshark-users] merge pcap from two interfaces



Hi Abhik,





Thank you for the reply.



The reason is, the server got few more interfaces too. I want to capture specifically etho and etho1, Not other 
interfaces. That's why I can't use "-i any".



Regards

Luke



On Saturday, 12 May 2018, 6:38:55 PM GMT+8, Abhik Sarkar <sarkar.abhik () gmail com<mailto:sarkar.abhik () gmail com>> 
wrote:





Hi Luke,

You could use mergecap (https://www.wireshark.org/docs/wsug_html_chunked/AppToolsmergecap.html).

Alternately, run tcpdump with "-i any" to have the capture for all interfaces in the same file (unless you have good 
reason to keep them separate, of course).

Regards,

Abhik



On 12 May 2018 at 14:14, luke devon via Wireshark-users <wireshark-users () wireshark org<mailto:wireshark-users () 
wireshark org>> wrote:

Hi



I have a server which has multiple ethernet interfaces and carrying network traffic to the system. every 15sec, roll 
out to the next tcpdump. Likewise, it will generate 4 - pcap file in a minute.



eth0 will generate 4 pcap files

eth1 will generate 4 pap files.



I wanna merge respective etho and eth1 files by matching with the time stamp.



can it be done? Please help.



Thank you
Luke














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