Greetings,

I have been trying to write a program to graph live traffic on a network interface. Tk::Graph has been very helpful to create live graphs.

The important problem, which I am not able to get through or find any good help is counting all incoming packets at a specified regular interval.

I have used Net::Pcap and Time::HiRes to write the following program to count interface traffic in 0.5 sec intervals of time. 

#!/usr/bin/perl -w

use strict;
use English;
use Net::Pcap;
use Time::HiRes qw (setitimer time ITIMER_REAL);

my($dev, $pcap_t, $err);

$dev = Net::Pcap::lookupdev(\$err);
$pcap_t = Net::Pcap::open_live($dev, 1500, 1, 0, \$err);

my $count = 0;
sub process_pkt {
    my ( $user_data, $hdr, $pkt ) = @_;
    $count++;
    $SIG{ALRM} = sub { print time, " $count\n"; $count = 0 };
    setitimer(ITIMER_REAL, 0.5, 0.5);
}

Net::Pcap::loop( $pcap_t, 0, \&process_pkt, "argument");
Net::Pcap::close($pcap_t);

[download]

Perl 5.8 installed on my linux is not configured with threads enabled. The output, as shown below, is generated at irregular intervals of time.

1069646988.25076 3
1069647025.00529 2
1069647031.59172 121
1069647033.06818 7
1069647037.78875 66

Any help or pointers towards a good solution will be greatly appreciated.

Thanks,
Prakash.

In reply to IP Packet count at regular intervals of time by prakashrj

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