code: function(firewall) {
        var t = Monitor.getRouter(); // This is a static method
        t.firewall = firewall;
        log.info('setFirewall', firewall);
      }
docs: Firewall new connections from inbound probe requests
  
  When two monitor processes connect, they become peers.  By default each
  process can request probe connections with the other.
  
  If you want to connect with a remote probe, but don't want those servers
  to connect with probes in this process, call this method to firewall
  those inbound probe requests.
  
  Setting this will change the firewall value for all *new* connections.
  Any existing connections will still accept incoming probe requests.
  
  @static
  @method setFirewall
  @param firewall {Boolean} - Firewall new connections?