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/etc/conf.d/net is the configuration file for Netifrc.
See:
Netifrc https://wiki.gentoo.org/wiki/Netifrc netifrc is Gentoo's default framework for configuring and managing network interfaces on systems running OpenRC.
https://wiki.gentoo.org/wiki/Handbook:AMD64/Networking/Introduction https://wiki.gentoo.org/wiki/Handbook:AMD64/Networking/Advanced https://wiki.gentoo.org/wiki/Handbook:X86/Full/Networking#Advanced_confi...
If you need to manage networks, you may need this server.
See: http://linux.overshoot.tv/net-misc/dhcpcd
If you do not need to manage networks, but simply need your computer to be connected to the internet via your ISP with the DHCP protocol, then you only need to install this client. http://linux.overshoot.tv/net-misc/dhcp https://wiki.gentoo.org/wiki/Dhcpcd https://wiki.gentoo.org/wiki/Network_management_using_DHCPCD