Maximum rate to send ICMP Destination Unreachable packets. This limits the rate at which packets are sent to any individual route or destination. The limit does not affect sending of ICMP_FRAG_NEEDED packets needed for path MTU discovery.
If this value is non-zero, Linux will ignore all ICMP_ECHO requests.
If this value is non-zero, Linux will ignore all ICMP_ECHO packets sent to broadcast addresses.
Maximum rate for sending ICMP_ECHOREPLY packets in response to ICMP_ECHOREQUEST packets.
Maximum rate for sending ICMP_PARAMETERPROB packets. These packets are sent when a packet arrives with an invalid IP header.
Maximum rate for sending ICMP_TIME_EXCEEDED packets. These packets are sent to prevent loops when a packet has crossed too many hops.