NAME

       tcptracer - Trace TCP established connections. Uses Linux eBPF/bcc.

SYNOPSIS

       tcptracer [-h] [-v] [-p PID] [-N NETNS] [--cgroupmap MAPPATH] [--mntnsmap MAPPATH]

DESCRIPTION

       This tool traces established TCP connections that open and close while tracing, and prints
       a line of output per connect, accept and close events. This includes the  type  of  event,
       PID, IP addresses and ports.

       This tool works by using kernel dynamic tracing, and will need to be updated if the kernel
       implementation changes. Only established TCP connections are traced,  so  it  is  expected
       that the overhead of this tool is rather low.

       Since this uses BPF, only the root user can use this tool.

REQUIREMENTS

       CONFIG_BPF and bcc.

OPTIONS

       -h     Print usage message.

       -v     Print full lines, with long event type names and network namespace numbers.

       -p PID Trace this process ID only (filtered in-kernel).

       -N NETNS
              Trace this network namespace only (filtered in-kernel).

       --cgroupmap MAPPATH
              Trace cgroups in this BPF map only (filtered in-kernel).

       --mntnsmap  MAPPATH
              Trace mount namespaces in the map (filtered in-kernel).

EXAMPLES

       Trace all TCP established connections:
              # tcptracer

       Trace all TCP established connections with verbose lines:
              # tcptracer -v

       Trace PID 181 only:
              # tcptracer -p 181

       Trace connections in network namespace 4026531969 only:
              # tcptracer -N 4026531969

       Trace a set of cgroups only (see special_filtering.md from bcc sources for more details):
              # tcptracer --cgroupmap /sys/fs/bpf/test01

FIELDS

       TYPE   Type of event. In non-verbose mode: C for connect, A for accept, X for close.

       PID    Process ID

       COMM   Process name

       IP     IP address family (4 or 6)

       SADDR  Source IP address.

       DADDR  Destination IP address.

       SPORT  Source port.

       DPORT  Destination port.

       NETNS  Network namespace where the event originated.

OVERHEAD

       This  traces  the  kernel  inet accept function, and the TCP connect, close, and set state
       functions. However, it only prints information for connections that are established, so it
       shouldn't have a huge overhead.

       As  always,  test  and  understand  this tools overhead for your types of workloads before
       production use.

SOURCE

       This is from bcc.

              https://github.com/iovisor/bcc

       Also look in the bcc distribution for a companion _examples.txt  file  containing  example
       usage, output, and commentary for this tool.

OS

       Linux

STABILITY

       Unstable - in development.

AUTHOR

       Iago López Galeiras

SEE ALSO

       tcpaccept(8), tcpconnect(8), tcptop(8), tcplife(8)