Building The Network You Need With PF, The OpenBSD Packet Filter: BSDCan 2016, Ottawa, Canada, June 8th 2016
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Path MTU Discovery

Negotiating critical communication parameters

Sending packets of various sizes within local-link MTU with "Do not fragment" flag set
Expecting ICMP reply "type 3, code 4"
-> "destination unreachable", "fragmentation needed, Do not fragment flag set"