Tools/Tshark

Why tshark rocks

• more functions than tcpdump
• shares features with Wireshark
• lives in /usr/bin
• can capture to a ring buffer
• capture and read filters

tshark command lines

statistics

tshark -qz io,stat,0.01,ip.addr==172.17.23.1
tshark -qz conv,eth
tshark -qz proto,colinfo,nfs
tshark -qz sip,stat
tshark -o "smb.sid_name_snooping:TRUE" -qz smb,sids

ring buffer capture

tshark -b 5 -a filesize:9728 -w mm.cap

read filter (live capture, read capture file)

tshark -r mm.cap -R "tcp.port!=50050&&ip.addr==172.17.23.5" -w clean.cap
  -R "not(ip.addr==172.17.23.5&&tcp.len==0)"
  -R 'pop.request || http.request.method==GET || http.request.method=="POST"'

capture filter (live capture)

-f not host 172.17.23.255

decode ports as specific service

tshark -d tcp.port==8888,http