What are the effects of options ip.ping_throttle.drop_level 0 on the system environment? The ping throttling mechanism was introduced to mitigate risks from denial of service attacks based on the ICMP...What are the effects of options ip.ping_throttle.drop_level 0 on the system environment? The ping throttling mechanism was introduced to mitigate risks from denial of service attacks based on the ICMP protocol. The existing ping throttling mechanism uses the value stored in the option ip.ping_throttle.drop_level option to obtain a threshold of packets to accept before dropping packets, in a one-second interval.