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data-rocket-location-hash="80e7b013ee3a39d5e25e1e5ef3fe01d3" id="primary" class="content-area"> <main data-rocket-location-hash="cbee32c6b03acdcb1433bbd49a4f7f16" id="main" class="site-main" role="main"> <article id="product-271373" class="post post-271373 course type-course status-publish hentry"> <header class="entry-header"> <h1 class="entry-title">PF-Paketfilter</h1> </header> <div class="entry-content"> <div id="produkt-pf" class="prod lang-de"> <div class="left"> <h2>Sichere Netzwerke mit der PF-Firewall</h2> <div class="container description"> <p>Die PF-Firewall ist eine der leistungsfähigsten Open-Source Firewall-Systeme. Diese Firewall ist Bestandteil von <a href="/kurs/openbsd">OpenBSD</a>, NetBSD und <a href="/kurs/freebsd">FreeBSD</a> und seit Version 10.7 'Lion' auch in Apple MacOS X anzutreffen.</p> <p>Dieses Training gibt eine Einführung in das Design von Netzwerken mit Firewall-Systemen anhand der Firewall 'pf'. Dabei werden auch fortgeschrittene Techniken wie redundante Firewall-Cluster und Load-Balancing mittels der PF-Firewall vermittelt.</p> <p>Der Kurs behandelt den Einsatz der PF-Firewall in <a href="/kurs/tcp-ip">IPv4</a> und <a href="/kurs/ipv6">IPv6</a> Netzwerken.</p> </div> <div class="container preconditions"> <h3>Voraussetzungen</h3> <p>Diese Schulung wendet sich an Systemadministratoren, die bereits Erfahrung mit Unix/Linux/BSD-Systemen und IP-Netzwerken (IPv4 oder IPv6) haben.</p> <p>Fast alle unten aufgeführten Themen werden anhand von praktischen Beispielen behandelt, und jeder Teilnehmer kann auf seinem Notebook selbst mitarbeiten. Beachten Sie bitte, dass Sie beim komplexen Thema Sicherheit schon einige Übung im Umgang mit Unix/Linux/BSD brauchen, um die besprochenen Techniken innerhalb der Schulungszeit umsetzen zu können. Das notwendige Netzwerk-Wissen für die Teilnahme kann u.A. im Kurs </p> <p><ul> <li><a href="/kurs/tcp-ip">TCP/IP</a> erworben werden.</li> </ul></p> <p> Entsprechende Betriebssystem-Kenntnisse können in den Kursen <ul> <li><a href="/kurs/admin_grundlagen">Linux Admin Grundlagen</a></li> <li><a href="/kurs/freebsd">FreeBSD</a></li> <li><a href="/kurs/openbsd">OpenBSD</a></li> </ul> erworben werden.</p> </div> <div class="container content"> <h3>Inhalt</h3> <div class="content"> <h4>Übersicht Firewall Technologien</h3> <ul> <li>Paket Filter</li> <li>Application Level Gateway</li> <li>Zustandsorientierte Paketüberprüfung (Stateful Packet Inspection)</li> </ul> <h4>Einsatzszenarien für Firewall Systeme</h3> <ul> <li>Perimeter Firewall</li> <li>interne Firewall</li> <li>Host-Firewall</li> </ul> <h4>Installation einer OpenBSD PF-Firewall</h3> <ul> <li>Vorbereitung</li> <li>Erstellen einer virtuellen Maschine</li> <li>OpenBSD Installationsmedien vorbereiten</li> <li>Den Installationsprozess starten</li> <li>Das OpenBSD Installations-Skript</li> <li>Starten des installierten OpenBSD Systems</li> <li>System-Dokumentation einsehen</li> <li>System-Logs einsehen</li> </ul> <h4>Initiale Konfiguration der PF-Firewall</h3> <ul> <li>Nutzerkontos hinzufügen</li> <li>Root Zugang gewähren</li> <li>Installation zusätzlicher nützlicher Software (z.b. Text-Editor)</li> <li>Nutzer-spezifische Einstellungen vornehmen</li> <li>SSH Passwort-Authentifizierung ausschalten</li> <li>Netzwerk-Schnitstellen konfigurieren</li> <li>Ein einfaches PF-Regelwerk</li> <li>Block Policy: 'drop' oder 'return'</li> <li>Makros und Listen</li> <li>Von der Kunst, verständliche Firewall-Regelwerke zu erstellen</li> <li>Dokumentation der Firewall Regeln</li> <li>Firewall Regeln prüfen, laden und löschen</li> <li>Datenpackete mit tcpdump beobachten</li> <li>PF-Log Informationen einsehen</li> <li>Erweiterung des simulierten Netzwerks</li> <ul> <li>IPv4-Forwarding aktivieren</li> <li>eine weitere Virtuelle Machine installieren</li> </ul> <li>NAT (Network-Address-Translation) einschalten</li> <ul> <li>PF-Anweisungen 'nat-to' und 'match'</li> <li>NAT im PF-Regelwerk aktvieren</li> </ul> <li>Statische Routen setzen</li> <li>Routing mit traceroute analysieren </li> <li>IPv6 Addressen konfigurieren</li> <li>ICMP / ICMPv6 / Neighbour Discovery / Link-Local Addressen</li> <li>Multicast</li> </ul> <h4>Application-Layer Gateway</h3> <ul> <li>HTTP Server einrichten</li> <li>Port-Weiterleitung einrichten</li> <li>NTP Server einrichten</li> <li>TLS-Proxy einrichten</li> </ul> <h4>Redundante PF-Firewalls mit CARP</h3> <ul> <li>Eine weitere Firewall installieren</li> <li>CARP konfiguieren</li> <li>PF-Konfiguration anpassen</li> <li>TLS-Proxy Konfiguration anpassen</li> <li>Firewall-Synchronisation einrichten (pfsync)</li> <li>CARP im internen Netzwerk</li> <li>CARP failover testen</li> </ul> <h4>Datenverkehr protokollieren und überwachen</h3> <ul> <li>Pflow konfigurieren</li> <li>Installation von nfsen</li> <li>Firewall-Logs auf einem zentralen Server speichern</li> </ul> <h4>IPsec VPN</h3> <ul> <li>IPsec konfigurieren</li> <li>IPsec und CARP im gemeinsamen Betrieb</li> </ul> <h4>Wireguard VPN</h3> <h4>Automatisierung der Firewall-Installation</h3> <ul> <li>Auto-Install vorbereiten</li> <li>Firewall automatisiert installieren</li> <li>Konfiguration nach der Installation</li> </ul> <h4>Traffic-Shaping</h3> <ul> <li>Vorbereitung zum Traffic-Shaping</li> <li>Daten-Durchsatz limitieren</li> <li>TCP ACK Pakete priorisieren</li> <li>Faire Paket-Warteschlangen einrichten</li> </ul> <h4>Netzwerkpakete markieren: PF-Tagging</h3> <h4>Regelwerk mit PF-Ankern dynamisch anpassen</h3> <h4>Tabellen als dynamische Datenquelle für das PF-Regelwerk</h3> <h4>Lastverteilung und Quality of Service</h3> <ul> <li>Layer-3 Lastverteilung</li> <li>Layer-7 Lastverteilung</li> </ul> <h4>Paket-Normalisierung</h3> <ul> <li>Fragmentierte IP-Pakete</li> <li>IP Metadaten normalisieren</li> <li>IP-Spoofing verhindern</li> </ul> <h4>Denial of Service Angriffe abwehren (SYN-Proxy)</h3> <h4>Filter basierend auf dem Betriebsystemen (OS-Fingerprinting)</h3> <h4>Mit dem eingebauten PF Regelwerk-Optimierer arbeiten</h3> <h4>DNS (Domain Name System) mit NSD und Unbound bereitstellen</h3> <ul> <li>DNS Zonen für NSD konfigurieren</li> <li>Einen DNS Haupt-Server einrichten (NSD)</li> <li>Einen DNS Secondary-Server einrichten (NSD)</li> <li>DNS Zonen aktuell halten</li> <li>Unbound konfigurieren</li> </ul> <h4>DHCP Server einrichten</h3> <h4>Email von der Firewall verschicken</h3> <ul> <li>SMTP Server mit Authentifizierung einrichten</li> <li>SMTP Smarthost verwenden</li> </ul> <h4>Firewall Backups</h3> <ul> <li>Backup Konzept</li> <li>Backup Nutzerkonto hinzufügen</li> <li>OpenBSD System-Backup mit dump/restore</li> </ul> <h4>Anpassung der installierten Firewall Software</h3> <ul> <li>Firewall-Installation mit eigenen Daten anreichern</li> <li>Eigene Software-Ports und Pakete erstellen</li> </ul> <h4>Firewallsystem aktuell halten</h3> <ul> <li>Errata mit syspatch installieren</li> <li>Errata via Quellcode Patch installieren</li> <li>Auf die nächste OpenBSD Version wechseln</li> <li>Software Pakete aktualisieren</li> </ul> <h4>Die OpenBSD Network-Shell (NSH)</h3> <ul> <li>NSH Kommando Syntax</li> <li>NSH Installation und Konfiguration</li> <li>Netzwerk-Schnittstellen mit NSH verwalten</li> <li>PF-Firewall mit NSH verwalten</li> <li>Systemdienste mit NSH verwalten</li> </ul> <h4>Knobelaufgaben</h3> <ul> <li>Das Root-Passwort zurücksetzen</li> <li>tmux</li> <li>Abbrechende SSH Verbindungen</li> <li>Vor langer Zeit in einer fernen Galaxie...</li> <li>Eine transparente Firewall</li> <li>Verschlüsselte Festplatte</li> <li>OpenBSD auf einem Laptop installieren</li> </ul> </div> </div> <div class="container times"> <h3>Kurszeiten</h3> <div class="content"> <p>Wer möchte, reist bis 22 Uhr am Vortag an und nutzt den Abend bereits zum Fachsimpeln am Kamin oder im Park.</p> <p>An Kurstagen gibt es bei uns ab 8 Uhr Frühstück.</p> <p> Unsere Kurse beginnen um 9 Uhr und enden um 18 Uhr. </p> <p>Neben den kleinen Pausen gibt es eine Stunde Mittagspause mit leckerem, frisch in unserer Küche zubereitetem Essen. </p> <p>Nach der Schulung anschließend Abendessen und Angebote für Fachsimpeln, Ausflüge uvm. Wir schaffen eine Atmosphäre, in der Fachleute sich ungezwungen austauschen. Wer das nicht will, wird zu nichts gezwungen und findet auch jederzeit Ruhe.</p> </div> </div> </div> <div class="right"> <p class="single-course-translation-row"><span>same course in English</span><a href="/courses/pf-en"><img class="flag" src="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%200%200'%3E%3C/svg%3E" data-lazy-src="/wp-content/themes/liho/img/lang/en.png"><noscript><img class="flag" src="/wp-content/themes/liho/img/lang/en.png"></noscript></a></p> <div class="container price"> <h5>Preis und Dauer</h5> <p>3 Tage, <br>1.567,62 € + 19% MwSt. = 1.865,47 €</p> <p><a href="/preise-und-infos/fur-seminarteilnehmer/">Übernachtungsoptionen</a></p> </div> <div class="container appointments" id="register-appointments"> <h5>Termine und Anmeldung</h5> <p>Es steht noch kein Termin für diesen Kurs fest.</p> <p>Haben Sie einen <a href="https://shop.linuxhotel.de/de/inquiries/pf/de/new">Wunschtermin</a>?</p>  </div> <div class="container relatedcourses"> <h5>Verwandte Seminare ...</h5> <p>... aus der Kategorie <a href="/categories/?cat=security">Sicherheit</a> </p> <ul> <hr><li><a href="/course/amavis-de">Amavis Spam&Virenfilter</a></li><li><a href="/course/android_reverse_engineering-de">Android Reverse Engineering</a></li><li><a href="/course/android-sicherheit-de">Android Security Foundations</a></li><li><a href="/course/memory-forensik-de">Arbeitsspeicher Forensik</a></li><li><a href="/course/asterisk-voip-sicherheit-de">Asterisk VoIP Sicherheit</a></li><li><a href="/course/ddos-de">DDoS Praxisworkshop</a></li><li><a href="/course/dnssec-de">DNS und BIND - Betrieb und Sicherheit</a></li><li><a href="/course/forensik-de">Digitale Forensik</a></li><li><a href="/course/firewall-de">Firewall & Netzwerksecurity</a></li><li><a href="/course/ipsec-de">IPsec</a></li><li><a href="/course/sicherheit-fuer-entwickler-de">IT-Sicherheit für Entwickler</a></li><li><a href="/course/lpi303-de">LPI 303 Security</a></li><li><a href="/course/malware_analyse-de">Malware-Analyse</a></li><li><a href="/course/netzwerk-forensik-de">Netzwerkforensik</a></li><li><a href="/course/opnsense-de">OPNsense</a></li><li><a href="/course/opnsense-einsteiger-de">OPNsense für Einsteiger</a></li><li><a href="/course/opnsense-fortgeschrittene-de">OPNsense für Fortgeschrittene</a></li><li><a href="/course/openbsd-de">OpenBSD</a></li><li><a href="/course/openvpn-de">OpenVPN</a></li><li><a href="/course/reverse-engineering-de">Reverse Engineering</a></li><li><a href="/course/server-sicherheit-de">Server Sicherheit</a></li><li><a href="/course/web_sicherheit-de">Sichere Webentwicklung</a></li><li><a href="/course/oauth-openid-security-de">Sicherheit für OAuth und OpenID Connect</a></li><li><a href="/course/rest-security-de">Sicherheit für REST APIs</a></li><li><a href="/course/deobfuscation-de">Software (De)-Obfuscation</a></li><li><a href="/course/suricata-de">Suricata</a></li><li><a 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