Tom Browder wrote: 
> I'm about to sign up for a fixed IPv4 address to my home. I know a bit
> about setting up simple internal networks, but want to make sure I'm
> doing it all correctly and securely. Does anyone have a good book they
> recommend for such use?


Almost certainly what you want is 

Concepts (old but useful):
        https://www.nftables.org/documentation/HOWTO/packet-filtering-HOWTO.html

What to do:
        
https://wiki.nftables.org/wiki-nftables/index.php/Simple_ruleset_for_a_home_router

How to do it in Debian:
        
https://www.debian.org/doc/manuals/debian-handbook/sect.firewall-packet-filtering.en.html

Reference:
        https://netfilter.org/

And the invaluable:

        https://stuffphilwrites.com/2014/09/iptables-processing-flowchart/

-dsr-

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