ifconfig用于配置网卡地址，改动后立即生效，但并不保存配置，下次启动后失效。
# ifconfig -a
lo0: flags=849 mtu 8232
inet 127.0.0.1 netmask ff000000
hme0: flags=863 mtu 1500
inet 172.16.255.2 netmask ffff0000 broadcast 172.16.255.255
ether 8:0:20:ee:11:51
＃ifconfig hme0 172.16.3.3 netmask 255.255.255.0
＃ifconfig –a
lo0: flags=849 mtu 8232
inet 127.0.0.1 netmask ff000000
hme0: flags=863 mtu 1500
inet 172.16.3.3 netmask ffffff00 broadcast 172.16.3.255
ether 8:0:20:ee:11:51
/etc/hosts
想要永久更改配置，则要更改配置文件，以网卡hme0为例：
#more /etc/hostname.hme0
Sunland
#more /etc/hosts
127.0.0.1 localhost
172.16.255.2 Sunland loGhost
#vi /etc/hosts
#more /etc/hosts
127.0.0.1 localhost
172.16.3.3 Sunland loghost
#more /etc/netmasks
#
# The netmasks file associates Internet Protocol (IP) address
# masks with IP network numbers.
#
# network-number netmask
#
# The term network-number refers to a number obtained from the Internet Network
# Information Center. Currently this number is restricted to being a class
# A, B, or C network number. In the future we should be able to support
# arbitrary network numbers per the Classless Internet Domain Routing
# guidelines.
#
# Both the network-number and the netmasks are specifIEd in
# "decimal dot" notation, e.g:
#
# 128.32.0.0 255.255.255.0
#vi /etc/netmasks
#more /etc/netmasks
#
# The netmasks file associates Internet Protocol (IP) address
# masks with IP network numbers.
#
# network-number netmask
#
# The term network-number refers to a number obtained from the Internet Network
# Information Center. Currently this number is restricted to being a class
# A, B, or C network number. In the future we should be able to support
# arbitrary network numbers per the Classless Internet Domain Routing
# guidelines.
#
# Both the network-number and the netmasks are specified in
# "decimal dot" notation, e.g:
#
# 128.32.0.0 255.255.255.0
172.16.3.0 255.255.255.0
＃reboot
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