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To address the scaling problem, a hierarchical namespace methodology was adopted for the Internet community which enforces uniqueness and supports timely distribution of updates. This namespace system is a client/server protocol called BIND Domain Name Service (DNS). Computers and organizations in DNS are identified by a domain name. The domain name is a string tuple delimited by "."s which represents the administrative hierarchy of the namespace (Table 2.3). Domain names are usually represented in two to four levels. Note that there is no implied mapping of domain names to IP number octets or subnets. Table 2.3 Domain Names
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A hierarchical name resolving protocol called BIND is used to recursively query domain name servers until a domain name is resolved to an IP number. In the DNS hierarchy (Figure 2.3), upper-level domain servers need only record the names of the next lower level of the name tuple along with the IP numbers of the name servers that resolve addresses for that level. All name servers must know the addresses of the top level Internet name servers which maintain a set of well-known top-level domain names (Table 2.4). The DNS system supports local management of the namespace and ensures timely information to the network at large. Table 2.4 Top Level Domains
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On the server side, DNS is implemented under UNIX by the named daemon. Usually only a pair of DNS servers, primary and secondary, are configured for a given organization. It is not necessary to run named on each machine in a network. The named daemon obtains configuration information from the set of configuration files listed in Table 2.5. The full scope of the format and syntax of these tables is often complex and beyond the purpose of this text. The reader is directed to documentation regarding DNS setup and configuration for the given UNIX platform.
Figure 2.3: Sample Internet domain hierarchy
Table 2.5 Named Configuration Files
named.boot named.ca named.data named.rev
Default domain, zone and authority Domain root cache prime information Local domain information Reverse query information
All the machines in the organization which will be using DNS need to know where to find the primary and secondary name servers. This information is recorded in a resolv.conf file on each machine (Example 2.3). When a domain name is resolved to an IP address, a query is sent to the first name server in the resolv.conf list. If timeout period expires before an answer is received from the first name server, then the second name server is queried.
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Example 2.3 resolv.conf ; /etc/resolv.conf ; domain foo.bar.org nameserver 123.145.100.1 nameserver 123.145.100.2
; default domain ; name server1 ; name server2
Inetd
Instead of running some of the TCP/IP service daemons continuously, they can be started when a request is made for the service and stopped when the service has been completed. This capability is supported by the inetd daemon. Configuration information for inetd is located in the /etc/inetd.conf and /etc/services files (Examples 2.4 and 2.5). Entries in the /etc/inetd.conf file indicate each service name and any required startup information. The /etc/service file lists the service name, whether it uses TCP or UDP protocols, and the well-known port number associated with the service. Each time updates are made to either of these tables the inetd daemon must be refreshed. This can be done by sending a hangup signal to the inetd PID. # kill -HUP <inetd-PID> Example 2.4 /etc/inetd.conf # inted.conf # # service # name # echo echo discard discard daytime daytime chargen chargen ftp telnet time time bootps tftp finger exec login shell talk
socket protocol wait/ type nowait stream dgram stream dgram stream dgram stream dgram stream stream stream dgram dgram dgram stream stream stream stream dgram tcp udp tcp udp tcp udp tcp udp tcp tcp tcp udp udp udp tcp tcp tcp tcp udp nowait wait nowait wait nowait wait nowait wait nowait nowait nowait wait wait wait nowait nowait nowait nowait wait
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