OpenGrok

tcpsnoop - snoop TCP network packets by process. Uses DTrace. tcpsnoop [-a|hjsvZ] [-n name] [-p pid] This analyses TCP network packets and prints the responsible PID and UID, plus standard details such as IP address and port. This captures traffic of newly created TCP connections that were established while this program was running. It can help identify which processes is causing TCP traffic. Since this uses DTrace, only the root user or users with the dtrace_kernel privilege can run this command. Solaris Nevada / OpenSolaris, circa late 2007 unstable - this script uses fbt provider probes which may change for future updates of the OS, invalidating this script. Please read Docs/Notes/ALLfbt_notes.txt for further details about these fbt scripts.

-a print all data

-j print project ID

-s print time, us

-v print time, string

-Z print zone ID

-n name command name to snoop

-p PID process ID to snoop

Default output, snoop TCP network packets with details, # tcpsnoop

Print human readable timestamps, # tcpsnoop -v

Print zonename, # tcpsnoop -Z

Print sshd traffic only, # tcpsnoop -n sshd

UID user ID

PID process ID

CMD command name

LADDR local IP address

RADDR remote IP address

LPORT local port number

RPORT remote port number

DR direction

SIZE packet size, bytes

TIME timestamp, us

STRTIME human readable timestamp, string

ZONE zone ID

PROJ project ID

See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output. tcpsnoop will print traffic until Ctrl-C is hit. Brendan Gregg [Sydney, Australia] tcptop(1M), dtrace(1M)

Indexes created Sat May 02 00:23:24 UTC 2026