Hi all,

I'm a Perl newbie and would have a question about data merging and finding reverse IP pairs. I have a tab separated list of network traffic containing source IP, destination IP and bytes transferred between the peers as follows:

Source IP            Destination IP    Bytes
10.0.0.24            93.188.134.219    32684
120.137.205.48        10.0.0.171        258
10.0.0.26            84.124.185.220    432
10.0.0.10            84.31.180.236    1476
84.31.180.236        10.0.0.10        4273

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I would need to aggregate the data (bytes) for each session (= source/destination IP pair = destination/source IP pair). In the above example data the last two lines should be aggregated as follows:

10.0.0.10            84.31.180.236        1476
84.31.180.236        10.0.0.10            4273

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=>

10.0.0.10            84.31.180.236        5749

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The order of the IPs doesn't matter. Finally the complete list of all data should be printed. Based on the above example the source data should finally be shown as:

10.0.0.24            93.188.134.219    32684
120.137.205.48        10.0.0.171        258
10.0.0.26            84.124.185.220    432
10.0.0.10            84.31.180.236    5749

[download]

I've created the following solution:

#!/usr/bin/perl

use strict;

my @lines;
open(D, $ARGV[0]) || die("Could not open file!\nUsage: $0 file ");
@lines = <D>;
close(D);

my %count;
foreach (@lines) {
        next if /^#|^(\s)*$/;
        chomp;
        my ($ipa, $ipb, $bytes) = split /\t\s?/;
        if((grep /$ipb/, %count) && (grep /$ipa/, (%{$count{$ipb}})))
                {
                $count{$ipb}{$ipa}+=$bytes;
                }
        else
                {
                $count{$ipa}{$ipb}+=$bytes;
                }
        }

foreach my $key(keys %count){
        foreach my $k(keys %{$count{$key}}){
        print "${key}\t$k\t$count{$key}->{$k}\n";
        }
}

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That works well for a small amount of data (for few thousands of lines) but is basically unusable for vast amount of data (I have over 77M lines to process).

I have been struggling to find a proper solution for the issue for the last three days but haven't progressed much. I would highly appreciate any help on this one. Thanks in advance! :)

Br, -=Markus=-

Ps.

How the same (aggregation of all data columns) can be done for data containing multiple columns? Like:

Source IP            Destination IP        Bytes    Packets    Flows
10.0.0.10            84.31.180.236        1476        241        22
84.31.180.236        10.0.0.10            4273        15        3
=>
10.0.0.10            84.31.180.236        5749        256        25

[download]

In reply to How to merge data in IP address pairs by -=Markus=-

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