use strict;

   use Net::SNMP;

   my ($session, $error) = Net::SNMP->session(
      -hostname  => shift || '192.168.1.1',
      -community => shift || 'public',
      -port      => shift || 161 
   );

   if (!defined($session)) {
      printf("ERROR: %s.\n", $error);
      exit 1;
   }

   my $sysUpTime = '1.3.6.1.2.1.1.3.0';

#
# Get system uptime of router
# 
   my $result = $session->get_request(
      -varbindlist => [$sysUpTime]
   );
   
   if (!defined($result)) {
      printf("ERROR: %s.\n", $session->error);
      $session->close;
      exit 1;
   }

   printf("sysUpTime for host '%s' is %s\n",
      $session->hostname, $result->{$sysUpTime} 
   );
   
   $session->close;

   exit 0;