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Das Firewall Buch. Grundlagen, Aufbau und Betrieb sicherer by Wolfgang Barth

By Wolfgang Barth

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Extra info for Das Firewall Buch. Grundlagen, Aufbau und Betrieb sicherer Netzwerke mit Linux

Example text

ICMP-Nachrichten enthalten im Datenteil den Header und die ersten 8 Bytes aus dem Paket, das die Fehlermeldung ausgelöst hat, um dem Absender die Zuordnung der Nachricht zur besseren Fehlererkennung zu ermöglichen. Ein Beispiel für die Anwendung von ICMP ist das Programm ping. ping ist ein Programm, das eine ICMP-Nachricht vom Typ echo request an einen Host sendet, die dieser mit einem ICMP-Nachrichtentyp echo reply beantwortet. Man kann damit feststellen, ob ein Host erreichbar ist (manche ping-Programme sagen dann einfach „host is alive“), und dazu einige Messungen (Antwortzeiten, Entfernung in Hops) durchführen.

Falls beim Proxy-Einsatz veränderte Verfahren notwendig werden, müssen diese schon bei den Installationsrichtlinien der Clients beziehungsweise bei der Information der Anwender berücksichtigt werden. 4 beschreibt einige Prinzipien des Firewallbaus. 3 und Kapitel 6. Welche Gefahrenpotentiale welche Dienste mit sich bringen, wird in Kapitel 7 beschrieben, die Konstruktion von Firewalls in Kapitel 8. ❏ Lokale Maßnahmen: Neben der Absicherung von Übergängen zwischen in- ternen und externen Netzwerkabschnitten (Firewall) dienen lokale Maßnahmen zur weiteren Verbesserung der Netzwerksicherheit.

Damit beschäftigt sich der nächste Abschnitt. Anschließend folgt ein kurzer Ausflug in die historische Entwicklung des Internet-Protokolls, bevor dieses dann ausführlicher behandelt wird. 1 Das OSI-Referenzmodell Um eine einheitliche Sprache und eine Referenzstruktur für die Interoperabilität unterschiedlicher Netzwerkprotokolle zu schaffen, wurde von der ISO das sogenannte OSI-Referenzmodell definiert (OSI: „Open System Interconnection“). 1) besteht aus sieben Schichten, die die Verbindung zwischen der eigentlichen Anwendung auf dem Computer und dem physikalischen Stück Draht (salopp gesprochen) herstellt, der mehrere Computer miteinander verbindet.

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