Description

PPP (Point to Point Protocol) sends Internet traffic over telephone (and other serial) lines. Ask your access provider if they support it, because otherwise you can't use it. An older protocol with the same purpose is called SLIP. Most Internet access providers these days support PPP rather than SLIP.

To use PPP, you need an additional program called pppd as described in the PPP-HOWTO, available at https://www.tldp.org/docs.html#howto. Make sure that you have the version of pppd recommended in Documentation/Changes. The PPP option enlarges your kernel by about 16 KB.

There are actually two versions of PPP: the traditional PPP for asynchronous lines, such as regular analog phone lines, and synchronous PPP, which can be used over digital ISDN lines for example. If you want to use PPP over phone lines or other asynchronous serial lines, you need to enable the PPP support for async serial ports option.