2024-06-13 19:21:56 +00:00
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- OSI layer 2 (data link layer) protocol. Technically, it occupies
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layers 1-3.
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- Same layer as BATMAN-Advanced.
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- Used for packet radio by hams.
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- Can transport network layer protocols, including IP.
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- Not designed to support switching, though routers can probably be set
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up to handle it.
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- Support in the Linux kernel.
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- v2.6.x: ax25.ko
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- Commonly used with three different communication specs:
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- Bell 103 tones @ 300bps
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- Bell 202 tones @ 1200bps
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- G3RUH DFSK @ 9600bps
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- These speeds are hard limits.
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- KISS encapsulates frames such that they can be send to a TNC for
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transmission. Derived from SLIP.
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- KISS is a serial protocol. Thus, multiple serial channels are required
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for multiple transceivers.
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- Other protocols fulfill the same function.
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- Either half or full duplex modes.
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- Three components
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- Kernel module
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- Configuration utilities
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- Utility software
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- Each AX.25 network device ("port") must be configured with a unique
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callsign/SSID. Hostnames are probably not a good idea.
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- We would be using [soundmodem](Notes_on_Soundmodem "wikilink") on top
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of AX.25.
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Configuring AX.25 network interface:
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` ifconfig sm0 hw ax25 `<callsign>` up`
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` Create an entry in /etc/ax25/axports for the network interface:`
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` sm0 `<callsign>` `<speed in bps>` `<maximum packet length>` <AX.25 window parameter (K)> `<description of interface>
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Once this is done, you can treat it like any other network interface:
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` ifconfig sm0 192.168.1.1 netmask 255.255.255.0`
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` route add -net 192.168.1.0 netmask 255.255.255.0 sm0`
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` route add default sm0`
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[Using /usr/bin/call to test an AX.25
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connection.](http://tldp.org/HOWTO/AX25-HOWTO/x1449.html)
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[Wikipedia: AX.25](https://secure.wikimedia.org/wikipedia/en/wiki/AX.25)
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[About AX.25](http://www.tapr.org/pub_ax25.html) [Linux AX.25
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Howto](http://tldp.org/HOWTO/AX25-HOWTO/)
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2024-06-13 01:48:44 +00:00
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[Category:Byzantium](Category:Byzantium "wikilink")
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