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How to get all tcp-stream by passed filter?

asked 2019-06-24 15:03:13 +0000

Hello!

I've been asked by our client why our server doesn't work properly. I have a 200MB pcap dump. Quickly watching I've seen many reasons why it could happen: client sends RST after SYN-ACK, ACK to FIN sometime takes about a whole second, big amount of data as response ( not a problem actually ) and so on.

So, I would like to find out which a problem is dominated to dig into a problem further. Result I would like to see is all tcp-stream getting by specified filters.

Well, my question is how to get all tcp-streams by specified filters and how to write a filter where time between FIN and ACK more then says 500ms ?

Can wireshark do it ? Thank you!

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answered 2019-06-24 18:56:48 +0000

Guy Harris gravatar image

Unfortunately, there's currently no filter to check for that (unlike, for example, checking for the time between the initial SYN and the SYN+ACK response).

You could try

tcp.analysis.ack_rtt > .5

to find all packets with an ACK that's more than .5 seconds (500 ms) after the packet being ACKed.

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Asked: 2019-06-24 15:03:13 +0000

Seen: 76 times

Last updated: Jun 24