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Old Pages/Old Wiki/AX.25.md

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+- OSI layer 2 (data link layer) protocol. Technically, it occupies
+  layers 1-3.
+- Same layer as BATMAN-Advanced.
+- Used for packet radio by hams.
+- Can transport network layer protocols, including IP.
+- Not designed to support switching, though routers can probably be set
+  up to handle it.
+- Support in the Linux kernel.
+  - v2.6.x: ax25.ko
+- Commonly used with three different communication specs:
+  - Bell 103 tones @ 300bps
+  - Bell 202 tones @ 1200bps
+  - G3RUH DFSK @ 9600bps
+  - These speeds are hard limits.
+- KISS encapsulates frames such that they can be send to a TNC for
+  transmission. Derived from SLIP.
+- KISS is a serial protocol. Thus, multiple serial channels are required
+  for multiple transceivers.
+- Other protocols fulfill the same function.
+- Either half or full duplex modes.
+- Three components
+  - Kernel module
+  - Configuration utilities
+  - Utility software
+- Each AX.25 network device ("port") must be configured with a unique
+  callsign/SSID. Hostnames are probably not a good idea.
+- We would be using [soundmodem](Notes_on_Soundmodem "wikilink") on top
+  of AX.25.
+
+Configuring AX.25 network interface:
+
+` ifconfig sm0 hw ax25 `<callsign>` up`
+
+` Create an entry in /etc/ax25/axports for the network interface:`
+`     sm0 `<callsign>` `<speed in bps>` `<maximum packet length>` <AX.25 window parameter (K)> `<description of interface>
+
+Once this is done, you can treat it like any other network interface:
+
+` ifconfig sm0 192.168.1.1 netmask 255.255.255.0`
+` route add -net 192.168.1.0 netmask 255.255.255.0 sm0`
+` route add default sm0`
+
+[Using /usr/bin/call to test an AX.25
+connection.](http://tldp.org/HOWTO/AX25-HOWTO/x1449.html)
+
+[Wikipedia: AX.25](https://secure.wikimedia.org/wikipedia/en/wiki/AX.25)
+[About AX.25](http://www.tapr.org/pub_ax25.html) [Linux AX.25
+Howto](http://tldp.org/HOWTO/AX25-HOWTO/)
+
+[Category:Byzantium](Category:Byzantium "wikilink")