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Next Previous Contents Linux AX25-HOWTO, Amateur Radio. Terry Dawson, VK2KTJ, terry@perf.no.itg.telstra.com.au v1.5, 17 October 2025 The Linux Operating System is perhaps the only operating system in the world that can boast native and standard support for the AX.25 packet radio protocol utilised by Amateur Radio Operators worldwide. This document aims to describe how to install and configure this support. 1. Introduction. 1.1 Changes from the previous version 1.2 Where to obtain new versions of this document. 1.3 Other related documentation. 2. The Packet Radio Protocols and Linux. 2.1 How it all fits together. 3. The AX.25/NetRom/Rose software components. 3.1 Finding the kernel, tools and utility packages. 4. Installing the AX.25/NetRom/Rose software. 4.1 Compiling the kernel. 4.2 The network configuration tools. 4.3 The AX.25 user and utility programs. 5. A note on callsigns, addresses and things before we start. 5.1 What are all those T1, T2, N2 and things ? 5.2 Run time configurable parameters 6. Configuring an AX.25 port. 6.1 Creating the AX.25 network device. 6.2 Creating the /etc/ax25/axports file. 6.3 Configuring AX.25 routing. 7. Configuring an AX.25 interface for TCP/IP. 8. Configuring a NetRom port. 8.1 Configuring /etc/ax25/nrports 8.2 Configuring /etc/ax25/nrbroadcast 8.3 Creating the NetRom Network device 8.4 Starting the NetRom daemon 8.5 Configuring NetRom routing. 9. Configuring a NetRom interface for TCP/IP. 10. Configuring a Rose port. 10.1 Configuring /etc/ax25/rsports 10.2 Creating the Rose Network device. 10.3 Configuring Rose Routing 11. Making AX.25/NetRom/Rose calls. 12. Configuring Linux to accept Packet connections. 12.1 Creating the /etc/ax25/ax25d.conf file. 12.2 A simple example ax25d.conf file. 12.3 Starting ax25d 13. Configuring the node software. 13.1 Creating the /etc/ax25/node.conf file. 13.2 Creating the /etc/ax25/node.perms file. 13.3 Configuring node to run from ax25d 13.4 Configuring node to run from inetd 14. Configuring axspawn. 14.1 Creating the /etc/ax25/axspawn.conf file. 15. Configuring the pms 15.1 Create the /etc/ax25/pms.motd file. 15.2 Create the /etc/ax25/pms.info file. 15.3 Associate AX.25 callsigns with system users. 15.4 Add the PMS to the /etc/ax25/ax25d.conf file. 15.5 Test the PMS. 16. Configuring the user_call programs. 17. Configuring the Rose Uplink and Downlink commands 17.1 Configuring a Rose downlink 17.2 Configuring a Rose uplink 18. Associating AX.25 callsigns with Linux users. 19. The /proc/ file system entries. 20. AX.25, NetRom, Rose network programming. 20.1 The address families. 20.2 The header files. 20.3 Callsign mangling and examples. 21. Some sample configurations. 21.1 Small Ethernet LAN with Linux as a router to Radio LAN 21.2 IPIP encapsulated gateway configuration. 21.3 AXIP encapsulated gateway configuration 21.4 Linking NOS and Linux using a pipe device 22. Where do I find more information about .... ? 22.1 Packet Radio 22.2 Protocol Documentation 22.3 Hardware Documentation 23. Discussion relating to Amateur Radio and Linux. 24. Acknowledgements. 25. Copyright. Next Previous Contents

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