$ sudo vim /etc/rc.conf

# 设置ip地址和子网掩码
ifconfig_em0="inet 192.168.0.108 netmask 255.255.255.0"
# 设置默认网关
defaultrouter="192.168.0.1"

$ sudo vim /etc/resolv.conf

nameserver 8.8.8.8
nameserver 8.8.4.4

$ sudo sh /etc/rc

$ sudo /etc/netstart