ndb - Network database
The network database consists of files describing machines known to the local installation
and machines known publicly. The files comprise multi-line tuples made up of
attribute/value pairs of the form attr=value or sometimes just attr. Each line starting
without white space starts a new tuple. Lines starting with # are comments.
The file /lib/ndb/local is the root of the database. Other files are included in the
database if a tuple with an attribute-value pair of attribute database and no value exists
in /lib/ndb/local. Within the database tuple, each tuple with attribute file identifies a
file to be included in the database. The files are searched in the order they appear.
declares the database to be composed of the three files /lib/ndb/common, /lib/ndb/local,
and /lib/ndb/global. By default, /lib/ndb/local is searched before the others. However,
/lib/ndb/local may be included in the database to redefine its ordering.
Within tuples, pairs on the same line bind tighter than pairs on different lines.
The program ndb/cs (see ndb(8)) and the library routine ipinfo (see ndb(2)) perform
searches for information relative to a particular host. Ndb/cs resolves meta-addresses of
the form $attribute by returning the value from the attribute=value most closely related
to the resolving host. The attribute-value pair comes from the tuple for the system, its
subnet, or its network with the system tuple having precedence, subnet next, and network
A number of attributes are meaningful to programs and thus reserved. They are:
sys system name
dom Internet domain name
ip Internet address
ether Ethernet address
dk Datakit address
bootf file to download for initial bootstrap
ipnet Internet network name
ipmask Internet network mask
ipgw Internet gateway
auth authentication server to be used
fs file server to be used
tcp a TCP service name
udp a UDP service name
il an IL service name
port a TCP, UDP, or IL port number
a TCP service that can be called only by ports numbered less that 1024
proto a protocol supported by a host. The pair proto=il is needed by cs (see ndb(8)) in
tuples for hosts that support the IL protocol.
9P parameters for the 9P file protocol, in particular whether the server authenticates
The file /lib/ndb/auth is used during authentication to decide who has the power to `speak
for' other users; see auth(6).
A tuple for the CPU server, spindle.
sys = spindle
Entries for the network mh-astro-net and its subnets.
ipnet=mh-astro-net ip=22.214.171.124 ipmask=255.255.255.0
Mappings between TCP service names and port numbers.
tcp=rexec port=512 restricted
first database file searched
second database file searched
dial(2), ndb(2), ndb(8), bootp(8), ipconfig(8), con(1)