Administration réseau sous Linux by Olaf Kirch

By Olaf Kirch

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Con guration de l'equipement reseau 40 Code reseau du noyau Linux Interface reseau Pilote de peripherique eth0 eth2 Pilote SMC eth1 eth3 Pilote 3Com Materiel Fig. 1 - Les relations entre les interfaces, les pilotes et le materiel. 1. Peripheriques, pilotes, etc. 41 les commandes et les donnees que le noyau envoie doivent passer par ces registres. La memoire d'E/S est generalement decrite en donnant son adresse de depart, ou adresse de base. Les adresses de base typiques pour les cartes Ethernet sont 0x300 ou 0x360.

Un message a destination de hostmaster devra ^etre redirige vers la personne en charge de la con guration reseau de base, et du serveur de noms si vous fournissez un DNS. 1 Securite du systeme Proteger votre machine et ses utilisateurs des intrus est un aspect tres important de l'administration systeme dans un environnement reseau. Negliger ce point peut o rir de nombreuses cibles aux malfaisants, les attaques pouvant aller de tentatives de decryptage des mots de passe a l'analyse de datagrammes, avec des consequences diverses comme courriers falsi es, destructions de donnees ou entrave a la vie privee de vos utilisateurs.

Il faut bien avoir a l'esprit que la subdivision de reseaux n'est qu'une division interne. Les sous-reseaux sont crees par le proprietaire du reseau (ou les administrateurs). Souvent, ils sont mis en place pour delimiter des zones precises, qu'elles soient physiques (entre deux Ethernet), administratives (entre deux departements), ou geographiques et une personne se voit deleguer la responsabilite de ces sous-reseaux. Mais cette structure n'a ecte que le comportement interne et est completement invisible pour le reste du monde.

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