firewall question

[Tom H]

On Sat, Mar 9, 2013 at 8:53 PM, Gerhard Magnus <magnus at agora.rdrop.com> wrote:
>
> I'm running Ubuntu 12.04 after switching from Fedora and am confused by the
> way Ubuntu handles its firewall. For example, ssh worked fine without my
> having to open port 22, which I had to do explicitly with Fedora in terms of
> allowing ssh as a trusted service.
>
> For Ubuntu, how can I determine which services are trusted by default? Is a
> service immediately trusted when it's installed and its ports open whenever
> it's started -- all in a way that's "transparent to the user"?
>
> Also, could some one direct me to a link that explains the basics of
> Ubuntu's firewall policies?

By default, Ubuntu doesn't have a firewall running like Debian.

You can turn on the firewall with "ufw enable" and allow ssh with "ufw
allow in ssh/tcp" to set up the right iptables rules.