Follow a TCP stream as ascii

Reassemble stream index 0 into readable ascii; prefer tshark over wireshark on servers

tshark -r cap.pcap -q -z follow,tcp,ascii,0
tool
tshark4 commands
tags
tsharkdebugnetworktroubleshooting

More tshark commands

  • TCP conversation statistics
    tshark -r cap.pcap -q -z conv,tcp

    Rank TCP conversations by bytes/packets to find top talkers in a capture

  • Live capture with I/O stat intervals
    tshark -i any -q -z io,stat,1,'COUNT(tcp.analysis.retransmission)tcp.analysis.retransmission'

    Per-second retransmission counts to correlate packet loss with app latency spikes

  • Extract fields to columns
    tshark -r cap.pcap -Y http.request -T fields -e ip.src -e http.host -e http.request.uri -E header=y

    Pull selected fields as a tabular header-prefixed table; pipe to awk/csv tooling

all 4 tshark commands