Man Linux: Main Page and Category List


       AF_NETROM - NET/ROM amateur packet radio protocol family


       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.


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


       Jonathan Naylor G4KLX <>