问题描述：
外网IP 192.168.0.3 掩码 255.255.255.0 网关 192.168.0.1
内部网络 172.16.10.22 掩码 255.255.255.0 网关 172.16.10.254
如何实现同时访问内外网?
说出详细步骤,解决问题补加50分给你
问题解答：
有种硬件就行...忘了叫什么了..VPN
不少公司的网管试图解决双网卡问题，下面给大家详细的讲解一下双网卡同时使用的方法，这样即可保障内网的安全，又能解决电脑访问外网的问题，一举两得。希望大家喜欢。
首先你的机器需要有两块网卡，分别接到两台交换机上,
internet地址：192.168.1.8，子网掩码：255.255.255.0，网关：192.168.1.1
内部网地址：172.23.1.8， 子网掩码：255.255.255.0，网关：172.23.1.1
如果按正常的设置方法设置每块网卡的ip地址和网关，再cmd下使用route print查看时会看到
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.8
0.0.0.0 0.0.0.0 172.23.1.1 172.23.1.8
即指向0.0.0.0的有两个网关，这样就会出现路由冲突，两个网络都不能访问。
如何实现同时访问两个网络？那要用到route命令
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"这个是主要的,意思就是你可以上外网.
第三步：route add 172.23.0.0 mask 255.0.0.0 172.23.1.1 "添加172.23.0.0网络路由"，注意mask为255.0.0.0 ，而不是255.255.255.0 ，这样内部的多网段才可用。
这时就可以同时访问两个网络了，但碰到一个问题，使用上述命令添加的路由在系统重新启动后会自动丢失，怎样保存现有的路由表呢？
route add -p 添加静态路由，即重启后，路由不会丢失。注意使用前要在tcp/ip设置里去掉接在企业内部网的网卡的网关
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一些单位将内网和外网分开了。痛苦啊，偶单位就是如此。boss当然是基于安全性考虑了，可是没有笔记本的怎么办？又要办公，有得上网。没办法，发扬DIY精神偷偷装一块网卡，让聊天与工作同在。让你的主机内外兼顾。这是我在网上找到的，谢谢作者了。方法如下：
1.设置其中接internet的网卡的网关为10.0.0.1，启用后就是默认网关
--注：这是对应外网的网卡，按照你们单位外网的ip分配情况，在TCP/IP属性中配置好 ip、掩码、DNS
2.将连接单位内部网的网卡IP配好后，设网关设置为空（即不设网关），启用后，此时内网无法通过网关路由
3.进入CMD，运行：route -p add 192.0.0.0 mask 255.0.0.0 192.168.0.1 metric 1
--注：意思是将192*的IP包的路由网关设为192.168.0.1 ，-P 参数代表永久写入路由表，建议先不加此参数，实践通过后在写上去
4. OK！同时启用两个网卡，两个网关可以同时起作用了，两个子网也可以同时访问了，关机重启后也不用重设！
其实这是个中折的办法。。。。使大家的双网卡同时运行，很不错的方法。大家学习一下吧。。
还有 ：开机的时候设置一下本地的路由表
把下面的命令写到一个bat里面，开机运行一下
route ADD [内网网的网络地址] MASK [内网的掩码] [通向内网的网关] METRIC 1
route ADD 0.0.0.0 MASK 0.0.0.0 [通向Internet的网关] METRIC 1
[]内的内容需要你修改成适合你网络的参数（修改后[]不保留），其他内容不用动
这个方法没有停用任何一块网卡，两个网卡还在同时工作，只是数据包的投递方向发生了改变，这样设置以后可以保证流向财务网的数据不向internet发送，流向internet的数据也不向财务网发送，各走各的路！
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如果不做服务器的话用双网卡写入路由表也可以实现
如果你有二网卡：
网通： 电信：
IP ：192.168.1.2 IP ：192.168.1.3
Mask:255.255.255.0 Mask:255.255.255.0
gateway:192.168.1.1 gateway:192.168.1.254
设置电信为默认网关：192.168.1.254
添加以下网通路由表：其中 *.*.*.* 改为你的网通网关地址就可，如上网通网关（192.168.1.1)，比软件还方便
注：以下网通网段更新于2006-2月，在dos命令提示符下粘上就可，或做一个bat命令运行。
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
route -p add 58.16.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 58.17.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 58.17.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 58.18.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 58.19.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 58.20.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 58.21.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 58.22.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 58.240.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 58.242.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 58.244.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 58.246.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 58.248.0.0 mask 255.248.0.0 *.*.*.* metric 1
route -p add 60.0.0.0 mask 255.248.0.0 *.*.*.* metric 1
route -p add 60.8.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 60.10.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 60.11.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 60.12.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 60.13.0.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 60.13.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 60.14.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 60.16.0.0 mask 255.248.0.0 *.*.*.* metric 1
route -p add 60.24.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 60.30.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 60.31.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 60.218.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 60.220.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 61.48.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 61.52.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 61.54.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.55.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.133.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 61.134.96.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 61.134.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.134.192.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.135.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.136.64.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.137.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 61.138.0.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.138.64.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.138.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.139.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.148.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 61.156.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.158.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 61.159.0.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.161.0.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 61.161.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 61.162.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.163.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.167.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.168.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.176.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.179.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.181.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.182.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 61.189.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 124.64.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 124.88.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 124.89.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 124.92.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 125.32.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 125.33.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 125.34.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 125.35.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 125.35.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 125.36.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 125.40.0.0 mask 255.248.0.0 *.*.*.* metric 1
route -p add 202.38.143.0 mask 255.255.255.0 *.*.*.* metric 1
route -p add 202.96.0.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 202.96.64.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.96.72.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.97.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 202.97.224.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.97.240.0 mask 255.255.240.0 *.*.*.* metric 1
route -p add 202.98.0.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.98.8.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.99.64.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 202.99.96.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.99.128.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 202.99.160.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.99.168.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.99.176.0 mask 255.255.240.0 *.*.*.* metric 1
route -p add 202.99.208.0 mask 255.255.240.0 *.*.*.* metric 1
route -p add 202.99.224.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.99.232.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.99.240.0 mask 255.255.240.0 *.*.*.* metric 1
route -p add 202.102.128.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.102.224.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.102.232.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 202.106.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 202.107.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 202.108.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 202.110.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 202.111.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 203.93.8.0 mask 255.255.255.0 *.*.*.* metric 1
route -p add 203.93.192.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 210.13.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 210.14.160.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 210.14.192.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 210.15.32.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 210.15.96.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 210.15.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 210.21.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 210.51.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 210.52.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 210.53.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 210.53.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 210.82.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 218.8.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 218.10.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 218.11.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 218.12.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 218.21.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 218.24.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 218.26.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 218.27.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 218.56.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 218.60.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 218.67.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 218.68.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 218.104.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 218.104.128.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 218.104.160.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 218.104.192.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 218.104.200.0 mask 255.255.248.0 *.*.*.* metric 1
route -p add 218.104.208.0 mask 255.255.240.0 *.*.*.* metric 1
route -p add 218.104.224.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 218.105.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 218.106.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 219.154.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 219.156.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 219.158.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 219.158.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 219.159.0.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 220.252.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.0.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 221.2.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.3.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.3.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.4.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.5.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.5.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.6.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.7.0.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 221.7.32.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 221.7.64.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 221.7.96.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 221.7.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.10.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.11.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.11.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 221.11.224.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 221.12.0.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.12.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 221.13.0.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 221.13.64.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 221.13.96.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 221.13.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.14.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 221.192.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 221.194.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.195.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.196.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 221.198.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.199.0.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 221.199.48.0 mask 255.255.240.0 *.*.*.* metric 1
route -p add 221.199.64.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 221.199.128.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 221.199.192.0 mask 255.255.240.0 *.*.*.* metric 1
route -p add 221.200.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 221.204.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 221.206.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.207.0.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 221.207.64.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 221.207.128.0 mask 255.255.128.0 *.*.*.* metric 1
route -p add 221.208.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 221.212.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.213.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 221.216.0.0 mask 255.248.0.0 *.*.*.* metric 1
route -p add 222.128.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 222.132.0.0 mask 255.252.0.0 *.*.*.* metric 1
route -p add 222.136.0.0 mask 255.248.0.0 *.*.*.* metric 1
route -p add 222.160.0.0 mask 255.254.0.0 *.*.*.* metric 1
route -p add 222.162.0.0 mask 255.255.0.0 *.*.*.* metric 1
route -p add 222.163.0.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 222.163.32.0 mask 255.255.224.0 *.*.*.* metric 1
route -p add 222.163.64.0 mask 255.255.192.0 *.*.*.* metric 1
route -p add 222.163.128.0 mask 255.255.128.0 *.*.*.* metric 1
修改路由表,添加静态路由.参看
http://zhidao.baidu.com/question/107046832.html 也可以到我空间看文章.
打开网络连接--本地连接--属性--Internet协议(TCP/IP)--属性--高级--添加IP和网关。
很简单，去掉内网网卡的网关,即172.16.10.254就可以了。 成功了告诉我一声呀，哈哈！！！
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