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At last static networking configuration for #Guix System gives more flexibility, IPv6 support, etc.:
https://guix.gnu.org/manual/devel/en/html_node/Networking-Setup.html
All this via Guile-Netlink by @roptat!
@civodul wish I had guile-netlink back in 2015 but I took one look at the work involved and said "nope!" so thanks @roptat for taking that on