Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# Making your network troubleshooting friendly

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