When to use a firewall (e.g. ufw)

[Ian Bruntlett]

Hi Oli,

On Fri, 20 Nov 2020 at 12:26, Oliver Grawert <ogra at ubuntu.com> wrote:

> ubuntu has since day one a policy of "no open ports" so if you do not
> install any server software (to explicitly open any ports), a firewall
> mainly just adds complexity ... that said, you can indeed "harden" an
> existing ubuntu install (i.e. make the machine not respind to external
> pings, audit and log incoming and outgoing traffic on a network
> interface, etc, etc) ...
>
Thank you, good to know :)

by default ubuntu does not need any firewall though and you should only
> use one if you know what you are doing ...
>

I've dabbled with LAMP in the past. I guess I'd need a firewall installed
for that.

At the moment, though, the only networking I'm doing is accessing the
Internet as a normal user.

I know of differences between IPv4 and IPv6 (that IPv6 can handle more
addresses), a little bit about TCP/IP, a little bit of sockets. I have a
copy of "Networking for Systems Administrators" (Michael W. Lucas) which I
will be reading soon...

BW,


Ian

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