DHCP

net-misc/dhcp

If you need to manage networks, you may need this server.

See:
http://linux.overshoot.tv/net-misc/dhcpcd

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

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