O Wireshark tem um utilitário de linha de comando. Eu usei em computadores remotos, onde eu só tinha acesso ao console, funciona muito bem. Leva apenas alguns minutos lendo os parâmetros para aprender a usá-lo.
C:\Program Files (x86)\Wireshark>dumpcap.exe -h
Dumpcap 1.10.3 (SVN Rev 53022 from /trunk-1.10)
Capture network packets and dump them into a pcapng file.
See http://www.wireshark.org for more information.
Usage: dumpcap [options] ...
Capture interface:
-i <interface> name or idx of interface (def: first non-loopback),
or for remote capturing, use one of these formats:
rpcap://<host>/<interface>
TCP@<host>:<port>
-f <capture filter> packet filter in libpcap filter syntax
-s <snaplen> packet snapshot length (def: 65535)
-p don't capture in promiscuous mode
-B <buffer size> size of kernel buffer in MB (def: 2MB)
-y <link type> link layer type (def: first appropriate)
-D print list of interfaces and exit
-L print list of link-layer types of iface and exit
-d print generated BPF code for capture filter
-k set channel on wifi interface <freq>,[<type>]
-S print statistics for each interface once per second
-M for -D, -L, and -S, produce machine-readable output
RPCAP options:
-r don't ignore own RPCAP traffic in capture
-u use UDP for RPCAP data transfer
-A <user>:<password> use RPCAP password authentication
-m <sampling type> use packet sampling
count:NUM - capture one packet of every NUM
timer:NUM - capture no more than 1 packet in NUM ms
Stop conditions:
-c <packet count> stop after n packets (def: infinite)
-a <autostop cond.> ... duration:NUM - stop after NUM seconds
filesize:NUM - stop this file after NUM KB
files:NUM - stop after NUM files
Output (files):
-w <filename> name of file to save (def: tempfile)
-g enable group read access on the output file(s)
-b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs
filesize:NUM - switch to next file after NUM KB
files:NUM - ringbuffer: replace after NUM files
-n use pcapng format instead of pcap (default)
-P use libpcap format instead of pcapng
Miscellaneous:
-N <packet_limit> maximum number of packets buffered within dumpcap
-C <byte_limit> maximum number of bytes used for buffering packets wi
thin dumpcap
-t use a separate thread per interface
-q don't report packet capture counts
-v print version information and exit
-h display this help and exit
Example: dumpcap -i eth0 -a duration:60 -w output.pcapng
"Capture packets from interface eth0 until 60s passed into output.pcapng"
Use Ctrl-C to stop capturing at any time.