iptables -L | grep -i icmp
ACCEPT     icmp --  anywhere             anywhere            icmp fragmentation-needed 
ACCEPT     icmp --  anywhere             anywhere            icmp time-exceeded 
ACCEPT     icmp --  anywhere             anywhere            icmp fragmentation-needed 
ACCEPT     icmp --  anywhere             anywhere            icmp time-exceeded 
ACCEPT     icmp --  anywhere             anywhere            
reject     icmp --  anywhere             anywhere            icmp echo-request 
ACCEPT     icmp --  anywhere             anywhere            
REJECT     udp  --  anywhere             anywhere            reject-with icmp-port-unreachable 
REJECT     icmp --  anywhere             anywhere            reject-with icmp-host-unreachable 
REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited