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cOS Core Administration Guide 12.00.13

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Clavister E80: neue Firewall für kleine und mittlere Firmen

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NG Firewall Clavister, podstawy konfiguracji internetu, adresacja IP, DNS, NTP

Stateful Inspection

Die Datenpakete werden analysiert und der Verbindungsstatus wird in die Entscheidung einbezogen. Bei dieser Technik, die in Firewalls eingesetzt wird, werden die Datenpakete (eigentlich: Segmente) während der Übertragung auf der Vermittlungsschicht (3. Schicht des OSI-Modelles) analysiert und in dynamischen Zustandstabellen gespeichert. Auf Basis des Zustands der Datenverbindungen werden die Entscheidungen für die Weiterleitung der Datenpakete getroffen. Datenpakete, die nicht bestimmten Kriterien zugeordnet werden können oder eventuell zu einer DoS-Attacke gehören, werden verworfen. Firewalls mit SPI-Technik sind daher in sicherheitsrelevanten Anwendungen den reinen Paketfilter-Firewalls überlegen. Quelle: Wikipedia Mehr Dazu Auch hier Info

cOS Core employs a technique called stateful inspection which means that it inspects and forwards traffic on a per-connection basis. cOS Core detects when a new connection is being established, and keeps a small piece of information or state in its state table for the lifetime of that connection. By doing this, cOS Core is able to understand the context of the network traffic which enables it to perform in-depth traffic scanning, apply bandwidth management and a variety of other functions. S. 22.

Dealing with Sync Failure

Failure of the sync interface can be confirmed by comparing the output from certain CLI commands for each unit. The number of connections could be compared with the stats command. If IPsec tunnels are heavily used, the ipsecglobalstat -verbose command could be used instead and significant differences in the numbers of IPsec SAs, IKE SAs, active users and IP pool statistics would indicate a failure to synchronize. If the sync interface is functioning correctly, there may still be some small differences in the statistics from each cluster unit but these will be minor compared with the differences seen in the case of failure. S. 658

Config Download mit Batch-Datei

  REM In case of one device you can use script command to download config as readable script.
  REM It can be easy done by simple batch
  @echo off
  set PUTTY="C:\Program Files\PuTTY"
  set ADDRESS=192.168.1.1
  set USER=admin
  set PASS=admin
  set LOCAL=script.txt
  set SCRIPT=%RANDOM%.txt
  %PUTTY%\plink.exe -ssh -pw %PASS% %USER%@%ADDRESS% "script -create -name=%SCRIPT%"
  %PUTTY%\pscp.exe -pw %PASS% %USER%@%ADDRESS%:script/%SCRIPT% %LOCAL%
  %PUTTY%\plink.exe -ssh -pw %PASS% %USER%@%ADDRESS% "script -remove -name=%SCRIPT%"

CLI console commands

  pcapdump        // This command starts up the packet capture mechanism on the clavister. This command is especially useful when troubleshooting connctivity issues.
  ipsectunnels and ipsecstats    // These two commands allow you to check whether a particular vpn tunnel is up or not.
  killsa          // This command will kill any IPSec connections to a particular remote peer IP. 
  ikesnoop        // For troubleshooting IPSec vpn negotiation issues. (similar to the “debug ike” / “debug ipsec” in cisco unit)
  ha              // high-availability environments, HA status of the current unit (active/passive)
  ha activate     // to handover “master” (active) control to the peer, or vice versa.
  ha deactivate
  if              //   Network