Tracer le volume qui passe sur un port donné

sudo tcpdump -i eth1 -l -e -n "port 5001" | ./netbps

Et le programme netbps

#!/usr/bin/perl
use strict;
use warnings;
use Time::HiRes;

my $reporting_interval = 10.0; # seconds
my $bytes_this_interval = 0;
my $start_time = [Time::HiRes::gettimeofday()];

STDOUT->autoflush(1);

while (<>) {
  if (/ length (\d+):/) {
    $bytes_this_interval += $1;
    my $elapsed_seconds = Time::HiRes::tv_interval($start_time);
    if ($elapsed_seconds > $reporting_interval) {
       my $bps = $bytes_this_interval / $elapsed_seconds;
       printf "%02d:%02d:%02d %10.2f Bps\n", (localtime())[2,1,0],$bps;
       $start_time = [Time::HiRes::gettimeofday()];
       $bytes_this_interval = 0;
    }
  }
}

Si telnet n'est pas disponible

telnet 127.0.0.1 5001

Avec timeout / bash

timeout 1 bash -c 'cat < /dev/null > /dev/tcp/127.0.0.1/5001'

Avec nc

nc -z 127.0.0.1 5001

Using ss :

ss -nlput | grep <process>

Using lsof :

lsof -i -P -n | grep LISTEN
lsof -i tcp:80

Using netstat :

netstat -tlnp
netstat -tnlp | grep :80

netstat -tulpn