.TH NDB 6.SH NAMEndb \- network data base.SH SYNOPSIS.B /lib/ndb/local.br.B /lib/ndb/inferno.br.B /lib/ndb/dns.br.B /lib/ndb/common.SH DESCRIPTIONNetwork configuration data is stored in one or more files in the directory.BR /lib/ndb ,in the attribute data base format defined by.IR attrdb (6).Most applications that use it start with.B /lib/ndb/localby default.That can refer (using a.B databaseentry) to other files that form part of the same logical database.They are stored in distinct files to allow different configurationsto avoid duplicating data by sharing some common content.For example,.B /lib/ndb/commonassociates service names with port numbers for Internet protocols,and.B /lib/ndb/infernoprovides the Inferno-specific port mapping.A database is automatically reread if any component file haschanged since it was last read (based on its modification time)..PPA network database gives particular meaning to the following attributes:.TF dnsdomainxx.TP.B authname or address of authentication server.TP.B bootfname of the file to send to a device on request when booting.TP.B dnsname or address of DNS resolver (see also the.B nsattribute below).TP.B dnsdomaindomain in which the local host lives (used to qualify unqualified names).TP.B domInternet domain name (host or DNS zone).TP.B etherEthernet address in the form accepted by.IR ether (2).TP.B fsname or address of file server.TP.B ilIL service name.TP.B infernositeempty-valued attribute that labels default site parameters.TP.B ipInternet address.TP.B ipgwname or address of Internet gateway.TP.B ipmaskInternet network mask.TP.B ipnetnetwork or subnetwork name.TP.B ipv4protoIPv4 protocol number (see also.BR protocol ).TP.B mxmail exchanger.TP.B nsname of a DNS name server for an associated.B dom.TP.B portport number for a service.TP.B protocolprotocol name.TP.B soastart of area (value is empty if locally authoritative, or.RB ` delegated 'if another server is authoritative).TP.B syssystem name (short local name for a host).TP.B tcpTCP service name.TP.B udpUDP service name.PD.PPInternet addresses and masks can be written in any formaccepted by.IR Ip (2).Network applications might use other attributes of their own,which they document on their own pages..PP.I Cs (8)interprets a host name of the form.BI $ serveras referring to the set of names and addresses that are valuesof the attribute.I serverin the network data base.Attributes in general use include some of those above, and the following:.TF FILESERVER.TP.B FILESERVERolder name for file server.B fsfile server.TP.B pop3mail reading service using the POP3 protocol.TP.B PROXYfirewall proxy for.IR ftpfs (4).TP.B SIGNERInferno authentication server running.IR logind (8)and/or.IR signer (8).TP.B smtpmail delivery gateway using the SMTP protocol.PD.PPOther such symbolic server names are mentioned in the manual pages for associated applications..PP.IR Dns (8)interprets.BR dnsand.BR dnsdomainvalues in any.B infernositeentry, and.BR dom ,.BR ip ,and.BR nsvalues more generally.When resolving a domain name,.I dnslooks first in this data base to see if there is a.B domentry for the name, and if so, whether there is either an associated.B nsattribute giving a name server to ask, or an.B ipattribute giving the name's IP address.Failing that, it works up the name hierarchy looking for name servers to ask.Failing that, it looks for a.B dnsdomainentry with.B dnsattributes listing other resolvers to ask.Bootstrap data is commonly stored in.BR /lib/ndb/dns ;by default it defines the root name servers:.IP.EXdom=    # root	ns=a.root-servers.net	ns=b.root-servers.net	\f1...\fPdom=a.root-servers.net ip=198.41.0.4dom=b.root-servers.net ip=128.9.0.107	\f1...\fP.EE.SH EXAMPLESpecify the site's default DNS domain name and resolvers for.IR dns (8),and a collection of symbolic service names for.IR cs (8):.IP.EXinfernosite=	dnsdomain=vitanuova.com	dns=200.1.1.11	dns=158.152.1.58	dns=158.152.1.43	SIGNER=doppio	FILESERVER=doppio	smtp=doppio	pop3=doppio	PROXY=doppio	GAMES=vivido	IRMSERVER=vivido.EE.SH FILES.B /lib/ndb/*.SH SEE ALSO.IR attrdb (2),.IR attrdb (6),.IR bootpd (8),.IR cs (8),.IR dns (8)