[GTALUG] Ubuntu -- Disabling Ping
Howard Gibson
hgibson at eol.ca
Wed Aug 29 23:23:08 EDT 2018
On Wed, 29 Aug 2018 21:54:15 -0400
Jamon Camisso via talk <talk at gtalug.org> wrote:
> On 29/08/18 21:44, Howard Gibson via talk wrote:
> > I am playing with my hack Ubuntu machine, and I am sorting out
> > security. I want to disable ping. This is a laptop, and I want to
> > document the application of aluminium foil.
> >
> > The standard ping disabler is the following line...
> >
> > # echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
> >
> > This works fine on my Fedora laptop. On Ubuntu, I get...
>
> The # makes me think you are root on the Fedora laptop.
Yes, I have a Fedora laptop, and that is how I disable ping.
> > $ sudo echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
> > -bash: /proc/sys/net/ipv4/icmp_echo_ignore_all: Permission denied
>
> That's expected with a sudo echo > redirect invocation. The shell is
> doing redirection. sudo is invoking echo, the output of which is being
> redirected in your normal user's shell to a file that you do not have
> permission to write to.
>
> Try this if you want to go the sudo route:
>
> echo 1 |sudo tee /proc/sys/net/ipv4/icmp_echo_ignore_all
It works!
Thank you.
Now all I have to do is stick it in a boot script.
--
Howard Gibson
hgibson at eol.ca
jhowardgibson at gmail.com
http://home.eol.ca/~hgibson
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