Is there a personal firewall for Linux / Ubuntu? [closed]

I am looking for some kind of personal firewall for Linux, that will monitor all outgoing connections and show me a message asking for permission to open that connection. Like the popular personal firewalls for Windows.

Does something like this exist?

Solution 1:

Firestarter or Guarddog would be the friendliest GUI interface to iptables.

• Firestarter
• Guarddog

But the short of it is... No, there doesn't seem to be an all-in-one firewall programme with popup notification.

< ubottu> Ubuntu, like any other linux  distribution, has firewall capabilities built-in. The firewall is managed using the 'ufw' command (see 
            https://help.ubuntu.com/community/Uncomplicated_Firewall_ufw), or 'iptables' (https://help.ubuntu.com/community/IptablesHowTo). GUI 
            applications such as Firestarter/Gufw (Gnome) or Guarddog (KDE) also exist

Solution 2:

I've looked for such a thing but haven't found one (yet)... in principle it might be possible to implement this using the nfnetlink_queue functionality in IPtables, but I think that's relatively new, so I wouldn't be entirely surprised that there's no program that takes advantage of it yet.

Solution 3:

Check out the Ubuntu server guide on firewalls.