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Linux Firewalls mit iptables & Co. by Ralf Spenneberg

By Ralf Spenneberg

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Sample text

4 Firewalls heute open source library 2 Firewall-Technologien Es gibt viele verschiedene Technologien, die beim Aufbau einer Firewall eingesetzt werden können. Dieses Kapitel stellt die wichtigsten vor und beschreibt ihre Funktionsweise sowie ihre Vor- und Nachteile. 1 Paketfilter Der Paketfilter ist die einfachste Technologie für die Implementierung einer Firewall. Die erste Implementierung geht auf Jeffrey C. pdf). Mogul stellte auf der USENIX Summer Conference im März 1989 mit dem Programm screend einen ersten Paketfilter vor.

Hierbei handelt es sich um Systeme, die die Pakete noch genauer analysieren und – besonders als Deep-Inspection-Systeme – eine Kombination aus Paketfilter und Intrusion-Detection-System oder Virenscanner darstellen. Hierzu prüfen die Systeme, ob über die Verbindung ein Angriff oder ein Virus übertragen wird. Auf Grund der Natur eines Paketfilters und der hohen Anforderung an die Geschwindigkeit, sind die Deep-Inspection-Systeme jedoch meist nicht so gut wie eine Kombination aus einem reinen Paketfilter und einem Virusscanner oder einem IDS.

Der screend ist ein Userspace-Programm, das die Entscheidung trifft, ob ein Paket passieren darf oder nicht. Im Grunde ist ein Paketfilter ein intelligenter Router. Während ein normaler Router lediglich entscheidet, wohin ein Paket geschickt wird, analysiert ein Paketfilter zusätzlich das Paket und bestimmt, ob ein Paket überhaupt weitergesendet werden darf oder ob es verworfen werden muss. Da diese beiden Aufgaben eng miteinander verwandt sind, werden seit damals fast alle Router mit zusätzlichen Paketfilterfunktionalitäten ausgestattet.

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