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. > $ 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 That way tee is invoked with elevated privileges and writes its output to the file. Or you can become root like on your Fedora system and use echo 1 >... Cheers, Jamon --- Talk Mailing List [email protected] https://gtalug.org/mailman/listinfo/talk
