The rule is (almost) any prop added to an interface record in
networks esmith DB is transferred to
ifcfg-* files in uppercase, preserving its value:
config setprop eth0 ifcfgkey1 ifcfgvalue1 [ifcfgkey2 ifcfgvalue2 ...]
Warning: a bad configuration can lock you out of your server!
What are the required ifcfg parameters for ipv6?