grc

Rock'n'Metal · 03-03-2008, 01:14 PM

i test my pc on grc.com and see my system answer to ping requests!
how can i close(block) ping requests?

win32sux · 03-03-2008, 01:45 PM

Quote:

Originally Posted by Rock'n'Metal

i test my pc on grc.com and see my system answer to ping requests!
how can i close(block) ping requests?

Assuming it's not your router which is replying, one way is:

Code:

echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all

Another is:

Code:

iptables -I INPUT -p ICMP --icmp-type 8 -j DROP

Rock'n'Metal · 03-03-2008, 03:03 PM

Quote:

Originally Posted by win32sux

Assuming it's not your router which is replying, one way is:

Code:

echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all

Another is:

Code:

iptables -I INPUT -p ICMP --icmp-type 8 -j DROP

i tested it answer "permission denied" but why grc said answer?

win32sux · 03-03-2008, 03:05 PM

Either of those commands will require root privileges.

unSpawn · 03-05-2008, 01:38 AM

While "stealth" sounds nice not answering to ping and traceroute requests does not necessarily a more secure system make. If you are going to invest time in beefing up security you best read a basic hardening HOWTO and start by reviewing, updating and protecting what services you're running and who you give access to before "stealthing" it.