How to check if ICMP blocking is enabled in a system..?
Solution 1:
To check whether ICMP is enabled or disabled run the command:
cat /proc/sys/net/ipv4/icmp_echo_ignore_all
The output is 0 or 1:
- 0 means that ICMP is enabled
- 1 means that ICMP is disabled
If it's disabled and you want to enable it:
- change 1 to 0 in the above file
-
Or run the command:
iptables -I INPUT -i ech0 -p icmp -s 0/0 -d 0/0 -j ACCEPT