| Firewalling with OpenBSD's PF packet filter: EuroBSDCon 2007, København, September 12th 2007 | ||
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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