Vmware提供了三种网络连接模式，分别为：

1、bridged(桥接模式):默认使用VMnet0，不提供DHCP服务

在桥接模式下，虚拟机和宿主计算机处于同等地位，虚拟机就像是一台真实主机一样存在于局域网中。因此在桥接模式下，我们就要像对待其他真实计算机一样为其配置IP、网关、子网掩码等等。

当我们可以自由分配局域网IP时，使用桥接模式就可以虚拟出一台真实存在的主机。

2、NAT(网络地址转换模式):默认使用VMnet8，提供DHCP服务

在NAT模式下，宿主计算机相当于一台开启了DHCP功能的路由器，而虚拟机则是内网中的一台真实主机，通过路由器(宿主计算机)DHCP动态获得网络参数。因此在NAT模式下，虚拟机可以访问外部网络，反之则不行，因为虚拟机属于内网。

使用NAT模式的方便之处在于，我们不需要做任何网络设置，只要宿主计算机可以连接到外部网络，虚拟机也可以。

NAT模式通常也是大学校园网Vmware最普遍采用的连接模式，因为我们一般只能拥有一个外部IP。很显然，在这种情况下，非常适合使用NAT模式。

3、Host-only(主机模式):默认使用VMnet1，提供DHCP服务

在Host-only模式下，相当于虚拟机通过双绞线和宿主计算机直连，而宿主计算机不提供任何路由服务。因此在Host-only模式下，虚拟机可以和宿主计算机互相访问，但是虚拟机无法访问外部网络。

当你想组成一个与物理网络相隔离的虚拟网络时，无疑非常适合使用Host-only模式。

VMware bridged

Bridged Networking:

If you use bridged networking, your virtual machine needs to have its own identity on the network. For example, on a TCP/IP network, the virtual machine needs its own IP address. Your network administrator can tell you whether IP addresses are available for your virtual machine and what networking settings you should use in the guest operating system. Generally, your guest operating system may acquire an IP address and other network details automatically from a DHCP server, or you may need to set the IP address and other details manually in the guest operating system.

If you use bridged networking, the virtual machine is a full participant in the network. It has access to other machines on the network and can be contacted by other machines on the network as if it were a physical computer on the network.

Be aware that if the host computer is set up to boot multiple operating systems and you run one or more of them in virtual machines, you need to configure each operating system with a unique network address. People who boot multiple operating systems often assign all systems the same address, since they assume only one operating system will be running at a time. If you use one or more of the operating systems in a virtual machine, this assumption is no longer true.(from http://www.vmware.com/support/ws4/doc/network_bridged_ws.html)

参考文献：
http://www.vmware.com/support/ws4/doc/network_bridged_ws.html
http://www.slyar.com/blog/vmware-bridged-nat-hostonly.html
http://blog.sina.com.cn/s/blog_4aa21085010091sk.html
http://www.javaeye.com/topic/403500