Network Information Service

Network Information Service

The Network Information Service, or NIS (originally called Yellow Pages or YP) is a client–server directory service protocol for distributing system configuration data such as user and host names between computers on a computer network. Sun Microsystems developed the NIS; the technology is licensed to virtually all other Unix vendors.

Because British Telecom PLC owned the name "Yellow Pages" as a registered trademark in the United Kingdom for its paper-based, commercial telephone directory, Sun changed the name of its system to NIS,[citation needed] though all the commands and functions still start with “yp”.

An NIS/YP system maintains and distributes a central directory of user and group information, hostnames, e-mail aliases and other text-based tables of information in a computer network. For example, in a common UNIX environment, the list of users for identification is placed in /etc/passwd, and secret authentication hashes in /etc/shadow. NIS adds another “global” user list which is used for identifying users on any client of the NIS domain.

Administrators have the ability to configure NIS to serve password data to outside processes to authenticate users using various versions of the Unix crypt(3) hash algorithms. However in such cases, any NIS client can retrieve the entire password database for offline inspection. Kerberos was designed to handle authentication in a more secure manner.

Successor technologies

The original NIS design was seen to have inherent limitations, especially in the areas of scalability and security, so other technologies have come to replace it.

Sun introduced NIS+ as part of Solaris 2 in 1992, with the intention for it to eventually supersede NIS. NIS+ features much stronger security and authentication features, as well as a hierarchical design intended to provide greater scalability and flexibility. However, it was also more cumbersome to set up and administer, and was more difficult to integrate into an existing NIS environment than many existing users wished.

As a result, many users chose to stick with NIS, and over time other modern and secure distributed directory systems, most notably LDAP, came to replace it. For example, slapd (the standalone LDAP daemon) generally runs as a non-root user, and SASL-based encryption of LDAP traffic is natively supported.

On large LANs, DNS servers may provide better nameserver functionality than NIS or LDAP can provide, leaving just site-wide identification information for NIS master and slave systems to serve. However, some functions — such as the distribution of netmask information to clients, as well as the maintenance of e-mail aliases — may still be performed by NIS or LDAP. NIS maintains nfs database information file as well as so called maps

External links


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Network Information Service — (NIS) Familia: Protocolos de sistema de archivos en red Función: servicio de información de red Ubicación en la pila de protocolos* Aplicación NIS …   Wikipedia Español

  • Network Information Service — (NIS) nommé aussi Yellow Pages est un protocole client serveur développé par Sun permettant la centralisation d informations sur un réseau UNIX. Sommaire 1 Présentation 2 Composition et fonctionnement 3 Commandes …   Wikipédia en Français

  • Network Information Service — NIS im Schichtenmodell Anwendung NIS Darstellung XDR Sitzung (Sun ) RPC Transport UDP Netzwerk IP Netzzugang Ethernet Token R …   Deutsch Wikipedia

  • Network Information Service — NIS (англ. Network Information Service, Информационная служба сети) это клиент серверный протокол, созданный Sun Microsystems, который позволяет обеспечивать доступ к системной конфигурации по всей сети. Первоначально назывался Yellow Pages… …   Википедия

  • Network Information Service —    Abbreviated NIS. A recent name for the security and file access databases on Unix systems, previously known as the Yellow Pages. The NIS for most Unix systems comprises the Unix host files /etc/hosts, /etc/passwd, and /etc/group …   Dictionary of networking

  • Network Information System — NIS im Schichtenmodell Anwendung NIS Darstellung XDR Sitzung (Sun ) RPC Transport UDP Netzwerk IP Netzzugang Ethernet …   Deutsch Wikipedia

  • Network-Centric Service-Oriented Enterprise (NCSOE) — is a new generation enterprise capable of conducting collaboration and management of internal and external information. Using Network Centric Enterprise Services (NCES) , the enterprise can now enforce information and decision superiority in a… …   Wikipedia

  • Network Information Table — Eine Transpondertabelle (auch NIT, Network Information Table) ist eine im Digitalempfänger hinterlegte Tabelle mit Transponderdaten, die zum Decodieren von Digitalen Signalen benötigt wird. Im Gegensatz zum Analogempfang, sind Digitalempfänger… …   Deutsch Wikipedia

  • Knowbot Information Service — The Knowbot Information Service (KIS), also known as netaddress, provides a uniform user interface to a variety of remote directory services such as whois, finger, X.500, MCIMail. By submitting a single query to KIS, a user can search a set of… …   Wikipedia

  • Nuclear Information Service — NIS (Nuclear Information Service) is a not for profit, independent information service based in the UK, which works to promote public awareness and foster debate on nuclear disarmament and related safety and environmental issues. [1] NIS collects …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”