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@elfin
i don't now
nor ever did have any great 'chops'
that said
on what we used to call 'Internet Core Protocols'
I was at least literate

i still ref to my ancient cisco cheatsheet docs to quickly lay out network subnets, never did memorise'em, and i can't do v6 math in my head

In my mind, I boggle, and think "my dudes! it's not *that* hard, wtf?"

but also, I mentally dismiss that value of, like you, 'but, you've been doing this stuff for 30+ years, , , mostly by-hand'