Network (Buster)
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Fairly universal for Debian-derived systems. Little has changed.
/etc/network/interfaces
# Friendly local loopback. auto lo iface lo inet loopback
# The primary network interface allow-hotplug eno1
# IPv4
iface eno1 inet4 static
address 192.168.119.218/29
gateway 192.168.119.217
dns-nameservers ::1 1.1.1.1 8.8.8.8
dns-search invalid
# Firewall script.
pre-up /root/firewall.sh
up /bin/ip addr add 192.168.119.219/29 dev eno1 label eno1:0
down /bin/ip addr del 192.168.119.219/29 dev eno1 label eno1:0
# ...
# IPv6!
iface eno1 inet6 static
address 2001:db8:0:4ee4::2/64
gateway 2001:db8:0:4ee4::1
dns-nameservers ::1 1.1.1.1 8.8.8.8
dns-search invalid
pre-up /root/firewall6.sh
# If you want, pick something that isn't going to get random-scanned for your ssh ip.
up /bin/ip -6 addr add dev eth0 2001:db8:0:4ee4:62e1:2091:be42:f322/64
down /bin/ip -6 addr del dev eth0 2001:db8:0:4ee4:62e1:2091:ve42:f322/64
# ...