1. 需求：
- 各个虚机(linux操作系统)之间可联网互访
- 各虚机可以上英特网
- 各虚机有静态ip地址，当主机的物理机器移动时（比如从公司将笔记本主机带到家或者咖啡馆）不影响已有网络配置
- 主机可以访问各个虚机
2. 方案：
1.将虚机的network配置为adapter1用host-only ,adapter2用NAT
hostonly 用来配置主机到虚机的访问，具有静态IP
NAT用来配置虚机到INTERNET的访问,具有动态 IP （DHCP）
2.In VirtualBox > Preferences > Network, set up a host-only network.
比如，it is manually configured:
ip 192.168.126.1
netmask 255.255.255.0
不要dhcp
-------ununtu:-------------------------------------
a..启动虚机，进入shell,执行
ls /sys/class/netb.在 shell 执行 sudo vi /etc/network/interfaces
将内容编辑为如下：
# The loopback network interface
auto lo
iface lo inet loopback
# Host-only interface
auto eth1
iface eth1 inet static
address 192.168.126.101
netmask 255.255.255.0
network 192.168.126.0
broadcast 192.168.126.255
# NAT interface
auto eth2
iface eth2 inet dhcp
在你的机器上根据你的需要配置ip,并改变eth1 或者eth2
如果是桌面版的，在菜单上选择network connection->edit connection,配置 Wired Connection(或 wireless connection) 和 Auto Ethnet。使得wired connection具有手动（manual）ipv4地址，而Auto Ethnet的ipv4为Automatic(DHCP);无需编辑/etc/network/interfaces
----------RPM based linux, such as Redhat /centOS
a. configure static IP for hostonly
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=xx:xx:xx:xx:xx:xx # Don't change, match your MAC_ADDRESS in virtual box setting
TYPE=Ethernet
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx # Don't change
ONBOOT=yes # no -> yes
NM_CONTROLLED=no # yes -> no
BOOTPROTO=none # dhcp -> none
# add bellow
IPADDR=192.168.56.10
NETMASK=255.255.255.0
b.configure DHCP for NAT
# vi /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
HWADDR=xx:xx:xx:xx:xx:xx # Don't change,match your MAC_ADDRESS in virtual box setting
TYPE=Ethernet
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx # Don't change
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp
3. start network service
service network restart 重启网络服务（也可以当作检测，如果有错误查看哪一步错误了）
ifconfig eth0 up 打开eth0 网卡
ifup etho up 打开网络接口