检测手机是否连接电脑使用网络?
只是想知道电话/互联网提供商如何检测手机的互联网连接是否用作连接到计算机的调制解调器,或者只是自行浏览互联网?
这些信息是否存储在数据包中,如果是,数据包的类型是什么以及它的外观如何?
谢谢。
Just wondering how phone/internet providers can detect if a mobile phone's internet connection is used as a modem connected to a computer, or just browsing internet by itself?
Is that information stored in packets, if so what type of packets and how does it look?
Thanks.
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是的,它很可能存储在 IPv4 数据包标头中。您可能会发现提供商可以检查TTL(生存时间) 。检测到与您设备上默认设置的 TTL 存在差异后,他们应该能够将您的数据包分类为源自移动设备或来自移动设备之外的网络设备。
请注意,如果您知道自己在做什么,则显然可以伪造此值(只要默认值不是 255,因为它是 8 位字段),因此这不是一个有保证的解决方案。
除此之外,他们总是可以检查任何 HTTP 请求上的用户代理字符串,以查看您是否使用基于 PC 的浏览器。再说一遍,如果有人有足够的决心改变这一切,这显然不是一个有保证的解决方案。
Yes, it most likely is stored in the IPv4 Packet header. You will probably find that the providers can examine the TTL (Time-To-Live). Detecting a TTL difference from that set as the default on the device you have, they should be able to sort out your packets as either originating from the mobile device or from a network device beyond it.
Note, you can obviously fake this if you know what your doing (and as long the default isn't 255, due to it being an 8bit field), so it is not a guaranteed solution.
Outside of this, they could always inspect the User-Agent strings on any HTTP requests to see if you are using a PC-based browser. Once again, this is obviously not a guaranteed solution if someone is determined enough to change all this.