By Gregor Purdy, Pejvan Beigui
Sous Linux, les pare-feu, le NAT (traduction d'adresses réseau), les connexions réseau et l'accounting sont tous fournis par le sous-système Netfilter, aussi connu des administrateurs sous le nom de los angeles commande iptables. L'interface d'iptables est l'une des plus sophistiquées que Linux suggest. Grâce à elle et à son huge éventail de règles, le filtrage des paquets entrant et sortant du réseau s'effectue de manière très souple et aussi finement que nécessaire.
Les iptables apportent une réponse élégante aux administrateurs qui se posent des questions quant à los angeles surveillance du trafic ICMP, los angeles simplification de los angeles gestion des connexions TCP, le choix du variety de trafic à autoriser.
Ce Précis et concis guidera quiconque doit fermer un port d'urgence, bloquer une attaque ou à l'inverse laisser passer un trafic very important. los angeles subtilité de l. a. syntaxe d'iptables autorise de choisir des valeurs qui correspondent exactement au niveau de sécurité recherché. Les iptables Linux - Précis et concis détaille les différentes ideas de cette commande pour régler vos pare-feu, l'accounting et le NAT.
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Additional resources for Les iptables LINUX - Précis et concis
You can think of the joined behaviour as pictured in Fig. 1 on the facing page. 4 General Behaviours We claim that any set of behaviours can be formed from atomic behaviours by applying one or more of the compositions outlined above: simple, concurrent, communicating, consecutive, joined and forked behaviours. , of atomic behaviours. From this set one can then “glue” together one or more behaviours ﬁrst forming a set of simple behaviours; then concurrent behaviours; then identifying possible communicating behaviours; then possibly joining and forking suitable behaviours, etc.
3 Composite Events Examples: (i) two or more cars crash and (ii) a bridge collapse causes one or more cars or bicyclists and people to plunge into the abyss Synchronising Events. Events in two or more simple behaviours are said to be synchronising iﬀ they are identical. Example: Two cars crashing means that the surfaces of the crash is a channel on which they are synchronising and that the messages being exchanged are “you have crashed with me” Sub-Events. A composite event deﬁnes one or more sub-events.
More concretely, “our” ontology consists of entities of the four kinds of speciﬁcation types: simple entities, operations, events and behaviours. One set of properties is that of an entity being ‘simple’, being ‘an operation’ (or function), being ‘an event’ or being ‘a behaviour’. We shall later introduce further categories of entity properties. 1 Simple Entities In a rather concrete, “mechanistic” sense, we understand simple entities as follows:2 simple entities have properties which we model as types and values.