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Is there any app that helps me to block all apps for accessing the internet when using 3g modem?

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    Do you mind clicking a few buttons yourself to switch profiles/etc or do you want it to block internet access automatically when you connect your modem?
    – grg
    May 10, 2014 at 18:52

2 Answers 2

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Little Snitch is like a Ferrari if you can afford it.

There is a now discontinued little app that does the same for 10.6 and before Yosemite.

TCPBlock:

Allows you to select who is to be blocked and who not.

TCPblock

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Yes, (assuming you are using Mac OS X), but you're not going to like the answer: pfctl. (Prior to OS X 10.7 Lion, the firewall was ipfw.)

Also, alternatively, you can use the GUI to configure pfctl (or ipfw).


Also, OS X includes an application firewall :

Allowing specific applications

To allow a specific app to receive incoming connections, add it using Firewall Options:

  • Open System Preferences.
  • Click the Security or Security & Privacy icon.
  • Select the Firewall tab.
  • Click the lock icon in the preference pane, then enter an administrator name and password.
  • Click the Firewall Options button
  • Click the Add Application (+) button.
  • Select the app you want to allow incoming connection privileges for.
  • Click Add.
  • Click OK.
  • You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button. 

There is also a third party application that is very popular called Little Snitch that will do what you ask.


Although I wouldn't recommend it for your purposes unless you were using it to learn about it for its own sake, OS X 10.6 Snow Leopard and above includes a sandbox facility (be sure to read the man pages listed under "SEE ALSO.")

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