1.临时更改,即时生效.

[root@freebsd7]# ifconfig

le0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500

options=8<VLAN_MTU>

ether 00:0c:29:21:2d:a6

inet 192.168.1.106 netmask 0xffffff00 broadcast 192.168.1.255

media: Ethernet autoselect

status: active

plip0: flags=108810<POINTOPOINT,SIMPLEX,MULTICAST,NEEDSGIANT> metric 0 mtu 1500

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384

inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3

inet6 ::1 prefixlen 128

inet 127.0.0.1 netmask 0xff000000

Freebsd# ifconfig le0 10.0.0.123 netmask 255.255.255.0

这种方法即时生效，但是重启机器后，信息不保留。

2.永久保留.

打开/etc/rc.conf

加入或修改：ifconfig_网卡名称="inet x.x.x.xnetmask x.x.x.x"

之后 reboot 或 #sh /etc/rc

Freebsd# more /etc/rc.conf

# -- sysinstall generated deltas -- # Thu Oct 12 09:37:56 2006

# Created: Thu Oct 12 09:37:56 2006

# Enable network daemons for user convenience.

# Please make all changes to this file, not to /etc/defaults/rc.conf.

# This file now contains just the overrides from /etc/defaults/rc.conf.

defaultrouter="10.0.0.1"

hostname="Freebsd.rhel5.com"

ifconfig_lnc0="inet 10.0.0.123 netmask 255.255.255.0"

keymap="us.iso"

linux_enable="YES"

sshd_enable="YES"

Freebsd#

这种方法，信息永久保留，但是修改完需要重启机器。

如果要设置多IP地址可用别名方式作修改如下

ifconfig_lnc0="inet 10.0.0.199 netmask 255.255.255.0"

改为

ifconfig_lnc0_alias0="inet 10.0.0.198 netmask 255.255.255.0"

ifconfig_lnc0_alias1="inet 10.0.0.197 netmask 255.255.255.0"