To pick a part of dump from 15:55 to 15:59, do:
lexus@lexus:~$ editcap -A '2018-07-26 15:55:00' -B '2018-07-26 15:59:00' 2018-07-26_full.pcap 2018-07-26_part.pcap
To pick a part of dump from 15:55 to 15:59, do:
lexus@lexus:~$ editcap -A '2018-07-26 15:55:00' -B '2018-07-26 15:59:00' 2018-07-26_full.pcap 2018-07-26_part.pcap