In this article, I explain how to configure the network in a FreeBSD system both statically and through DHCP, and how to overwrite certain parameters even after acquiring the configuration through DHCP.

Static IP:

hostname="server1.example.com"
ifconfig_em0="inet 10.10.10.100 netmask 255.255.255.0"
defaultrouter="10.10.10.1"

DHCP IP:

hostname="server1.example.com"
ifconfig_em0="DHCP"

If we request an IP through DHCP but want to use other DNS servers:

supersede domain-name-servers 8.8.8.8, 8.8.4.4;