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PING www.google.com (173.194.34.146) 56(84) bytes of data.
64 bytes from lhr14s21-in-f18.1e100.net (173.194.34.146): icmp_seq=1 t
+tl=55 time=394 ms
...
64 bytes from lhr14s21-in-f18.1e100.net (173.194.34.146): icmp_seq=9 t
+tl=55 time=75.9 ms
^C

using Net::Ping  (Range 500-1000 ms)
1031.06737136841 ms
...
560.385465621948 ms
650.154113769531 ms

#!/usr/bin/perl -w
use strict;
...
        $basetime = clock_gettime();
    }