code: def collect_iptable(self, tablename):
          
  
          modname = "iptable_"+tablename
          if self.check_ext_prog("grep -q %s /proc/modules" % modname):
              cmd = "iptables -t "+tablename+" -nvL"
              self.add_cmd_output(cmd)
docs: When running the iptables command, it unfortunately auto-loads
          the modules before trying to get output.  Some people explicitly
          don't want this, so check if the modules are loaded before running
          the command.  If they aren't loaded, there can't possibly be any
          relevant rules in that table