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CONFIG_AX25: Amateur Radio AX.25 Level 2 protocol

General informations

The Linux kernel configuration item CONFIG_AX25:

Help text

This is the protocol used for computer communication over amateur radio. It is either used by itself for point-to-point links, or to carry other protocols such as tcp/ip. To use it, you need a device that connects your Linux box to your amateur radio. You can either use a low speed TNC (a Terminal Node Controller acts as a kind of modem connecting your computer's serial port to your radio's microphone input and speaker output) supporting the KISS protocol or one of the various SCC cards that are supported by the generic Z8530 or the DMA SCC driver. Another option are the Baycom modem serial and parallel port hacks or the sound card modem (supported by their own drivers). If you say Y here, you also have to say Y to one of those drivers.

Information about where to get supporting software for Linux amateur radio as well as information about how to configure an AX.25 port is contained in the AX25-HOWTO, available from You might also want to check out the file Documentation/networking/ax25.rst in the kernel source. More information about digital amateur radio in general is on the WWW at

To compile this driver as a module, choose M here: the module will be called ax25.



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