|Building The Network You Need With PF, The OpenBSD Packet Filter: BSDCan 2016, Ottawa, Canada, June 8th 2016|
Mainly concerns the Internet Control Message Protocol (ICMP)
Control Messages (transmission parameters, packet sizes, routing, path MTU discovery)
Mid 1990s Ping of Death scare - ICMP 'just evil', 'a necessary evil'
Modern OSes not vulnerable; people are still scared