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Any recommendations on a good path to learn this — curious if you have any personal, opinionated thoughts on this.

Buy some cheap computer, pop in a few NICs, setup a FreeBSD or OpenBSD gateway, including DNS and some other goodies.

And by cheap, any $10 relic will do.

You’ll find their manuals very informative.

I'll add looking up the ipv4 and ipv6 specs on www.rfc-editor.org .