ROS Code for blocking ICMP

RouterOS General
1

Hi

Can anybody help me with the ros code to block all ICMP requests from internal network to Internet , except only one destination in Internet ( for example 4.2.2.2 ) to be allowed .

Abhishek

2

/ip firewall filter
add action=drop chain=forward dst-address=!4.2.2.2 protocol=icmp src-address=192.168.88.0/24-Chris

3

Thanks.

Abhishek