In need of filter to see SYN packets not receiving a SYN/ACK

Question

Hi I am trying to filter a packet capture where I can view SYNs not receiving a SYN/ACK back. I am not sure how to accomplish this.

Erik

Answer 1

0

Assuming the client enters retransmission if it is not receiving a SYN-ACK in time a possible filter would be tcp.analysis.retransmission and tcp.flags.syn==1 - This will not catch the initial SYN packet though.

If it sends a RST after giving up this filter might catch those

 (tcp.flags.reset==1 and tcp.seq==1)

You can combine those with a 'or' of course

permanent link

answered 27 Feb '14, 13:06

mrEEde
3.9k●15●22●70
accept rate: 20%

edited 27 Feb '14, 13:11

Answer 2

0	see my answers (and the links therein) to the same question. http://ask.wireshark.org/questions/10640/how-to-find-syn-not-followed-by-a-synack Regards Kurt permanent link answered 28 Feb '14, 07:31 Kurt Knochner ♦ 24.8k●10●39●237 accept rate: 15%

In need of filter to see SYN packets not receiving a SYN/ACK

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You have a trillion packets.

You need to see four of them.

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