Can you stop ping replies with gufw? I changed /proc/sys/ne/ipv4/icmp_echo_ignore_all to 1
but it doesn't seem to help. I went to Shields-Up site: https://www.grc.com/x/ne.dll?bh0bkyd2
and tested my firewall. It failed! Port 443 https is open. But Gufw default closes all incoming
connections. Plus it's accepting ping.