I have created this file
/proc/sys/net/ipv4/icmp_echo_ignore_all couple of months ago on my centos 7 server to disable ping requests permanently and now I can not undo this!
I'm logged in as
root user but still can not use command
rm /proc/sys/net/ipv4/icmp_echo_ignore_all to remove this file! I even checked immutable bit and its not set on that file... I get the same error:
rm: cannot remove ‘/proc/sys/net/ipv4/icmp_echo_ignore_all’: Permission denied
But magically i can edit file with
nano without errors but editing not cause any chances to enable icmp ping requests again! I think it must be removed but seems to be impossible!
can anyone help??