--- /dev/null
+#!/usr/bin/perl
+
+# Module: VNET+
+# Description: Generate ping packets and count the responses
+# Author: sapanb@cs.princeton.edu
+
+use strict;
+use threads;
+
+#please change to something local
+my $guineapig='planetlab-1.cs.princeton.edu';
+my $numiter=1000;
+
+sub run {
+ system("ping -c $numiter -i 0.1 $guineapig");
+ }
+
+
+sub open_tcpdump {
+ my $filter="icmp and src $guineapig";
+ my $cmdline="/usr/sbin/tcpdump -c $numiter $filter";
+
+ system($cmdline);
+}
+
+sub alhandler {
+ print "[FAILED] tcpdump apparently did not intercept all SYN/ACK packets\n";
+ exit(-1);
+}
+
+print "Starting tcpdump...\n";
+my $tcpdthr=threads->create(\&open_tcpdump);
+sleep 10;
+print "Generating connections...\n";
+run;
+$SIG{ALRM}=\&alhandler;
+alarm(60);
+
+$tcpdthr->join;
+print "[SUCCESS] Test completed OK.\n";