NDB(6) Games Manual NDB(6)
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. For example:
declares the database to be composed of the three files /lib/ndb/com-
mon, /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 dif-
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 last.
A number of attributes are meaningful to programs and thus reserved.
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
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 proto-
9P parameters for the 9P file protocol, in particular whether the
server authenticates (9P=auth).
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=220.127.116.11 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)