How To Check If Icmp Is Blocked In Linux?
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1. Using the ping command:
The simplest way to check if ICMP is blocked is to use the ping command in a terminal. Open a terminal and type in the following command:
ping <IP address>
Replace <IP address> with the IP address of the host you want to test. If the host responds, then ICMP is not blocked. If the host does not respond, then ICMP is blocked.
2. Using netstat command:
Another way to check if ICMP is blocked is to use the netstat command. This command will list all the active network connections, including ICMP connections. Open a terminal and type in the following command:
netstat -an
Look for the lines containing ICMP in the output. If there are any, then ICMP is not blocked. If there are none, then ICMP is blocked.
To check if ICMP is blocked in Linux, you can use the traceroute command. Traceroute will report whether the ICMP packets are being blocked. To run the command, open the terminal and type “traceroute <IP address>”, replacing <IP address> with the IP address of the machine you’re trying to trace. If traceroute fails to find the route, it means that ICMP packets are being blocked.
To check if ICMP is blocked in Linux, you will need to run the following command:
sudo iptables –L –v –n
This command will list all of the active rules in the iptables firewall. Look for a rule with the “icmp” protocol listed and if it is present, then ICMP is not blocked. If there is no such rule, then ICMP is likely blocked.