On Sat, 30 Dec 2017, Patrick Dohman wrote: > I’m looking to determine if the cause of intermittent subnet > “collisions” that necessitate power cycle of numerous networks hosts is > the result of OpenBSD security configurations
You haven't described your setup or what you're actually running on your OpenBSD box, so I don't know how OpenBSD is even *involved* in what you're asking about. ... > Essentially If security configurations that disable for example > broadcast echo & address mask query can lead to unexpected results. For > example MTU size & TCP window scaling options requiring the results of a > broadcast ICMP echo. Path MTU detection is dependent on ICMP "fragmentation required" responses, but OpenBSD generates, processes, and passes those by default. TCP window scaling is not dependent on any sort of ICMP. > Or if unintended result of the stateless UDP traffic never reaching it’s > destination due to security config can result in ICMP UDP MTU errors. Uh, no. Frankly, this sounds like grasping at straws; you need to pause and actually write down *testable* details before trying to come up with (more) hypotheses. As I wrote before: >> If the latter, then you should take it down a level and describe what you >> tried to do, what you expected to see "on the wire/in the air", and what >> you _actually_ saw there? Philip Guenther
