netromd - Send and receive NET/ROM routing messages
netromd [-c] [-d] [-i] [-l] [-p pause] [-q quality] [-t interval] [-v]
For a NET/ROM based network to operate correctly, a periodic broadcast
of routing information needs to occur. Typically this occurs once every
hour on every port which is expected to carry NET/ROM traffic. The
purpose of netromd is to send and receive NET/ROM routing broadcasts.
To operate correctly a set of parameters that corresponds to each AX.25
port needs to be passed to the program. This information is encoded in
a configuration file, by default which is /etc/ax25/nrbroadcast with
each line representing one port, see the manual page for
To cut down the length of these routing broadcasts, only the
information about the highest quality neighbour for a particular node
is transmitted. The transmission is also limited to those node that
have a certain minimum value in their obsolesence count, this value is
decremented every time a routing broadcast is transmitted, and is
refreshed by receiving a routing broadcast which contains that
The value of the default quality is traditionally assigned a value that
represents the quality of the radio links on that port. A higher number
representing better radio links with 255 (the maximum) reserved for
wire connections. The practise in the UK is to set the default quality
to a low value, typically 10, and manually set up the trusted
neighbouring nodes in the neighbour list manually. The worst quality
for auto-updates value is a way to filter out low quality (ie distant)
The verbose flag may be either 0 or 1, representing no and yes. By
specifying no, the program will only generate a routing message
containing information about the node on which it is running, by
specifying the yes option, all the information in the nodes routing
tables will be transmitted. The quality advertised for the other node
callsigns on this machine may be set using the -q option.
Between each transmission netromd pauses for five seconds (default) in
order to avoid flooding the channels that it must broadcast on. The
value of this delay is settable with the -p option.
-c Forces strict compliance to Software 2000
specifications. At present this only determines how
node mnemonics with lower case characters will be
handled. With compliance enabled mixed case node
mnemonics will be ignored. The default is to accept
node mnemonics of mixed case.
-d Switches on debugging messages, the default is off.
Logging must be enabled for them to be output.
-i Transmit a routing broadcast immediately, the default
is to wait for the time interval to elapse before
transmitting the first routing broadcast.
-l Enables logging of errors and debug messages to the
system log. The default is off.
-p pause Sets the delay between transmissions of individual
routing broadcast packets. The default is five seconds.
-q quality Sets the quality of the subsidiary nodes relative to
the main node. The default is 255.
-t interval The time interval between routing broadcasts, in
minutes. The default is 60 minutes.
-v Display the version.
ax25(4), axports(5), nrbroadcast(5), netrom(4), nrparms(8).
Jonathan Naylor G4KLX <firstname.lastname@example.org>