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|Firewall: ICMP Filter|
|Desktop Training - Fedora|
ICMP or Internet Control Message Protocol is used to provide information about network connections. If you are on a local network that is secure you can leave these connections active to provide connection testing and information. This will assume that your external firewall guarding your network from the Internet does not allow these type of messages. The reason you do not want ICMP message from the Internet is that these message can provide an attacker with a lot of information.
Here is an example of the most common ICMP message use.
Ping stands for Packet Internet Groper.
The command is: ping –c 5 18.104.22.168