这几天，一直在研究如何通过usb来让联通版上网，论坛里也出现一同研究这个问题的帖子：
大家请看：
http://bbs.weiphone.com/read-htm-tid-674467.html
http://bbs.weiphone.com/read-htm-tid-544715.html
一个是不越狱，一个是越狱，方法差不多。
我也一开始尝试通过这个方法也成功了，但有点美中不足的是：
有些不是http的协议的程序还是费3G流量。
而且如果不使用autoproxy的方式，每次都要重启手机，使用了autoproxy总有点心理阴影，感觉一开始上网有点慢，就是第一次打开网页有点慢，不知道是不是我心里感觉的问题。
有人说都有usb了，还用什么手机上网，旁边就有电脑啊，（论坛出现了不和谐的声音），请你搬凳子坐好，听我讲：我们玩手机，就是一个玩，玩手机非要在一个没有电脑的地方玩？
还有，你既然这么说，请问你有wifi的地方，也差不多有电脑了，你还要手机上网干嘛，请把你的wifi也去掉…..
好了，废话不多说了，现在说说方法：
方法和以通过代理的方法差不多，主要通过usb或者蓝牙共享的方式和电脑建立一个小的局域网：
iPhone的IP:192.168.20.1 电脑的IP:192.168.20.2
为了不让你的电脑走3G的网络，你可以手工设置一下电脑上的那个IP，把网关部分去掉。
然后就是在你的电脑上架设一个路由器，你可以使用xp自带的”网络共享”，设置好了以后，再去改那个apple的网卡的IP，因为设置以后，xp会自动把那个网卡的地址设为：192.168.0.1，我们是要把它改成192.168.20.2
或者可以下载一些专门的路由小软件，比如我这里使用的;”Sinfor NAT” ,免费软件。
弄好了以后，这是第一步。
然后ssh连到你的iPhone,用192.168.20.1这个IP地址连
然后上传附件，并运行。就可以通过USB上网了。
完成了：
有几个问题，希望大家能一起讨论一下：
我是使用：
route add -net 1.0.0.0 192.168.20.2 255.0.0.0
route add -net 2.0.0.0 192.168.20.2 255.0.0.0……
route add -net 254.0.0.0 192.168.20.2 255.0.0.0
route add -net 255.0.0.0 192.168.20.2 255.0.0.0
更改默认路由是不行的，但我手工更改一个a或者c地址也是可以的。
于是我就把 1.0.0.0.0/8-255.0.0.0/8所以路由加了一下，这里浪费了我很多时间，百思不得其解，最后没有办法弄了这一个笨方法。
我是这样分析的：因为我更改了/etc/resolv.conf 这里的dns服务器，但ping的时候，发现并没有使用这里的dns服务器，而使用dig这个命令（你可以安装bind，就自带这个命令了）是使得这里的dns设置的，这就是让我不解之一了，所以我怀疑，如果是我更忙了默认路由，就会造成dns解析失效（网通DNS是禁止非自己的IP过来的请求解析的），不过这也不能解释我更改了路由后，直接访问IP也不行。
以下是有一些可能有用的命令，请参考：
route add –host 目的地IP 网关
route add –net 目的地网段 网关
route change
route delete (注意，删除时使用 route delete 8.0.0.0 这样的方式)
route change default
netstat –rn 显示路由表
注意的是：ping 命令不可靠，可以使用wget 来测试。
更详细的请参考：
http://developer.apple.com/mac/library/….man8/route.8.html
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