通过调制解调器连接到基于 Linux 的服务器
我有一个带有调制解调器的黑盒设备（我可以向其发送命令），并且希望能够连接以将数据发送到服务器。 我有哪些连接选项？PPP 是我需要使用的协议还是有更好的选择？
I have a black-box device with a modem attached (which I can send commands to), and would like to be able to connect to send data to a server from it. What connectivity options do I have, is PPP the protocol I need to use or is there a better option?
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ppp 无疑是通过调制解调器获取 IP 连接的最常见解决方案。 还有其他解决方案，但如果您需要的是 IP 连接，则没有理由不使用 PPP。
如果您不需要 IP 连接并且正在编写客户端和服务器，您也可以从一个调制解调器到另一个调制解调器进行直接串行连接，但这有点老派。
ppp is certainly the most common solution for getting an IP connection over a modem. There are other solutions, but there's no reason not to use PPP if what you need is an IP connection.
If you don't need an IP connection and you're writing both the client and the server, you could also do a straight serial connection from one modem to another, but that's kind of old-school.
如果您还需要 IP 网关和路由，PPP 可能是您的最佳选择。 如果您只需要终端访问设备，并且它运行某种形式的 *nix，那么您可能可以选择 getty+串行通信。 您可以在另一端使用任意数量的调制解调器终端客户端。
PPP is probably your best option, if you also want an IP gateway and routing. If you only need terminal access to the device, and it runs some form of *nix, you probably have getty+serial communication as an option. You can use any number of modem terminal clients on the other side.