To use the amateur radio protocols within Linux you will need to get a suitable copy of the AX.25 Utilities. More detailed information about these and associated programs can be found on http://zone.pspt.fi/~jsn/. For more information about the AX.25, NET/ROM and ROSE protocol stacks, see the AX25-HOWTO written by Terry Dawson who is also the AX.25 Utilities maintainer. There is an active mailing list for discussing Linux amateur radio matters called linux-hams. To subscribe to it, send a message to majordomo@vger.kernel.org with the words "subscribe linux-hams" in the body of the message, the subject field is ignored. Jonathan G4KLX g4klx@g4klx.demon.co.uk