NAME

       AF_NETROM - NET/ROM amateur packet radio protocol family

DESCRIPTION

       NET/ROM  is  a  protocol  used  extensively  by radio amateurs. The Linux NET/ROM protocol family permits
       access to these protocols via the standard networking socket metaphor.

       The NET/ROM protocol layer only supports connected mode. IP traffic may be  stacked  on  top  of  NET/ROM
       frames using a non-standard extension to the NET/ROM protocol.

       The  only  mode of operation is connected mode which is the mode used for a socket of type SOCK_SEQPACKET
       (stream sockets are not available in NET/ROM).  This requires  that  the  user  ensures  output  data  is
       suitably packetised, and that input data is read a packet at a time into a buffer of suitable size.

       NET/ROM  addresses  consist  of 6 ascii characters and a number called the SSID. These are encoded into a
       sockaddr_ax25 structure which is provided to the relevant system calls.

       NET/ROM has some unusual properties. Notably in a multi-user system an AX.25 address is often  associated
       with a user, and some users may not have such an association. a set of ioctl calls are provided to manage
       an association table.

       NET/ROM supports the following socket options for SOL_NETROM. NETROM_T1 is the T1 timer in 1/10ths  of  a
       second,  NETROM_T2  is  the  T2  timer  in  1/10ths  of  a  second.  NETROM_N2, the retry counter is also
       configurable. There is no 'infinite retry' option supported however. It is possible for an application to
       request  that  the  NET/ROM layer return the NET/ROM header as well as the application data, this is done
       via the NETROM_HDRINCL socket option.

SEE ALSO

       call(1), socket(2), setsockopt(2), getsockopt(2), nrbroadcast(5),  nrports(5),  netromd(8),  noderest(8),
       nodesave(8), nrparms(8).

AUTHOR

       Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>