Looking to block Ports on AirPort Extreme

I'm looking to block specific ports when you access a particular service online. I the number of ports I need to block already, but I do not know how to block. I use an iMac running OS X El Capitan 10.22.6 and an AirPort Extreme v7.6.7. Any tips?

To the airport

By default all IPv4 ports on an AirPort base station are closed (not ' hidden') to the incoming traffic from the Internet, like the base station uses a simple based on NAT "firewall." However, all ports are open going out.

If you use a service on the Internet that you send the traffic, the return traffic will access specific ports that the application told him, to complete the loop. If your goal is to 'close' this loop, then you will need to port forward that return traffic to a client is no local network as a potential solution. Not sure how your app will be with some communications being blocked.

Nevertheless, the solution is to port before the unwanted incoming ports to a local IP address that is outside the DHCP for the network scope. By default, the DHCP of the airport service provides addresses in the 10.0.1.2 - 10.0.1.200 range. You would then be the port forward to attack from 201 up to 254.

For example, if you want to block the 800 port, you would put in place a port card in AirPort Utility as follows:

  • Run the AirPort Utility.
  • Select the base and then station, select change.
  • Select the network tab.
  • Select it '+' plus button under Port settings.
  • Enter a description in the Description box.
  • Public UDP ports: 800
  • Public TCP ports: 800
  • Private IP address: 10.0.1.201
  • Private UDP ports: 800
  • Public TCP ports: 800

For your Mac

To block all incoming connections to a specific application, use the system preferences, as follows:

  • System Preferences > Security & privacy > select it '+' plus button to add the application.
  • Select the option "Block incoming connections" for this application.
  • Click OK.

Note: If you want more control over the software firewall in OS X, you need to look into a third party app that does this. Some of them are: Murus and Little Snitch

Tags: Wireless

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