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.
From: luke devon [mailto:luke_devon@xxxxxxxxx]
Sent: Sunday, May 13, 2018 6:00 AM
To: Community support list for Wireshark <wireshark-users@xxxxxxxxxxxxx>; Maynard, Chris <Christopher.Maynard@xxxxxxx>
Subject: Re: [Wireshark-users] merge pcap from two interfaces
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
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.
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?
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
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".
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
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.
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