想同时访问内网，外网遇到个问题，就是当访问内网的时候，外面就没法访问，反之亦然。经过研究终于找到，同时访问两个网络的方法。
比如
一个网络的地址：192.168.1.110，子网掩码：255.255.255.0，网关：192.168.1.1
另一个网络的地址：192.168.128.130，子网掩码：255.255.255.0，网关：192.168.128.2
第一步：route delete 0.0.0.0 “删除所有0.0.0.0的路由”
第二步：route add 0.0.0.0 mask 0.0.0.0 192.168.1.1 “添加0.0.0.0网络路由”
第三步：route add 0.0.0.0 mask 255.0.0.0 192.168.128.2 “添加10.0.0.0网络路由”
使用上述命令添加的路由在系统重新启动后会自动丢失，route add -p 添加静态路由，注意使用前要在tcp/ip设置里去掉接网卡的网关。
我用这个就是虚拟机上用的，一个是让虚拟机能够访问本机的共享资源，而虚拟机又能通过另外一个无线网卡同时访问外部网络，而不是通过本机网络访问外网。
route命令可以在CMD DOS窗口中执行，主要看看route delete 和 route add。
route参数说明：
Manipulates network routing tables.
ROUTE [-f] [-p] [command [destination]
[MASK netmask] [gateway] [METRIC metric] [IF interface]
-f Clears the routing tables of all gateway entries. If this is
used in conjunction with one of the commands, the tables are
cleared prior to running the command.
-p When used with the ADD command, makes a route persistent across
boots of the system. By default, routes are not preserved
when the system is restarted. Ignored for all other commands,
which always affect the appropriate persistent routes. This
option is not supported in Windows 95.
command One of these:
PRINT Prints a route
ADD Adds a route
DELETE Deletes a route
CHANGE Modifies an existing route
destination Specifies the host.
MASK Specifies that the next parameter is the ‘netmask’ value.
netmask Specifies a subnet mask value for this route entry.
If not specified, it defaults to 255.255.255.255.
gateway Specifies gateway.
interface the interface number for the specified route.
METRIC specifies the metric, ie. cost for the destination.
All symbolic names used for destination are looked up in the network database
file NETWORKS. The symbolic names for gateway are looked up in the host name
database file HOSTS.
If the command is PRINT or DELETE. Destination or gateway can be a wildcard,
(wildcard is specified as a star ‘*’), or the gateway argument may be omitted.
If Dest contains a * or ?, it is treated as a shell pattern, and only
matching destination routes are printed. The ‘*’ matches any string,
and ‘?’ matches any one char. Examples: 157.*.1, 157.*, 127.*, *224*.
Diagnostic Notes:
Invalid MASK generates an error, that is when (DEST & MASK) != DEST.
Example> route ADD 157.0.0.0 MASK 155.0.0.0 157.55.80.1 IF 1
The route addition failed: The specified mask parameter is invalid.
(Destination & Mask) != Destination.
Examples:
> route PRINT
> route ADD 157.0.0.0 MASK 255.0.0.0 157.55.80.1 METRIC 3 IF 2
destination^ ^mask ^gateway metric^ ^
Interface^
If IF is not given, it tries to find the best interface for a given
gateway.
> route PRINT
> route PRINT 157* …. Only prints those matching 157*
> route CHANGE 157.0.0.0 MASK 255.0.0.0 157.55.80.5 METRIC 2 IF 2
CHANGE is used to modify gateway and/or metric only.
> route PRINT
> route DELETE 157.0.0.0
> route PRINT