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>