Der Paketfilter bei OpenWrt
Der Paketfilter bei OpenWrt
Über das Buch
OpenWrt bietet sich als alternatives Betriebssystem an für SOHO-Router, die nicht mehr oder zu selten aktualisiert werden. Aufgrund seiner Modularität eignet es sich auch für andere Projekte mit der unterstützten Hardware. Somit sind die Hürden, einen Router mit OpenWrt zu betreiben, sehr gering.
Dabei sollte nicht außer Acht gelassen werden, dass mit einem schlecht gewarteten Router sehr leicht beinahe jeder Zugriff auf die angeschlossenen Netzwerke und die darin enthaltenen Geräte erlangen kann.
Hier kann man mit dem in OpenWrt enthaltenen Paketfilter regulierend eingreifen.Wenn man die nötigen Kenntnisse besitzt.
Das ist das zentrale Thema des Buches: es will die nötigen Kenntnisse zum verantwortungsvollen Betrieb einer Paketfilter-Firewall, speziell mit Linux und insbesondere bei OpenWrt vermitteln. Dementsprechend sind die Schwerpunkte des Buches:
- grundlegende Kenntnisse über IP-Netzwerke für den Betrieb einer Paketfilter-Firewall,
- die Wirkungsweise des Netfilter-Systems bei Linux und
- die Konfiguration von Netfilter bei OpenWrt.
Ergänzt wird das Buch durch einige Kapitel, die sich speziellen praktischen Fragen rund um den Betrieb einer Paketfilter-Firewall mit OpenWrt widmen.
License
Über den Autor
Table of Contents
-
- Vorwort
-
Allgemeine Fragen
- Was ist OpenWrt?
- Was kann ich damit machen?
- Möglichkeiten und Grenzen
- Alternativen zum OpenWrt-Paketfilter
-
Grundlagen Netzwerkprotokolle
- Aufgaben eines Paketfilters
- Um welche Protokolle geht es?
- IPv4 für den Firewall-Administrator
- IPv6 für den Firewall-Administrator
- Gleichzeitiger Betrieb von IPv4 und IPv6
- ICMP und IGMP
- ICMPv6 für den Firewall-Administrator
- Network Address Translation
-
Grundlagen OpenWrt Paketfilter
- Netfilter: Kernel-Komponenten
- Netfilter: Benutzerprogramme
- Besonderheiten des Linux-Kernels
- Ein Modell der Firewall-Regeln bei OpenWrt
- Die Webschnittstelle LuCI
- Die zentrale Konfigurationsschnittstelle UCI
-
Praktische Fragen
- Wie ermittle ich meine persönlichen Anforderungen?
- Auswahl von Hardware und Software
- Härten des Systems
- Testen der Firewall
- Monitoring
- Kann ich Paketfilter umgehen?
- Wo platziere ich ein Tunnel-Gateway?
- Wie dokumentiere ich das System?
- Zusätzliche Software
- System aktualisieren
-
Anhang
- Analyse von Iptables-Firewalls
- Risikoanalyse
- Sicherheitsrichtlinien
- Glossar
- Literatur
- Kolophon
- Index
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