FortiGate Conserve Mode Logs
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Questions and Answers

Which log can be viewed on the CLI when the GUI is unresponsive in conserve mode?

  • Proxy Inspection
  • diagnose debug crashlog read (correct)
  • antivirus fail-open
  • config system global

    • What governs FortiGate behavior for proxy-based inspection while in conserve mode?

  • config system global
  • antivirus fail-open (correct)
  • diagnose debug crashlog read
  • Proxy Inspection

    • What is the default setting for av-failopen-session?

  • pass (correct)
  • off
  • one-shot
  • enable

    • What happens to new sessions that require content inspection when av-failopen is set to 'off'?

    <p>They are dropped</p> Signup and view all the answers

    What is the purpose of the av-failopen-session setting?

    <p>Enable or disable failopen</p> Signup and view all the answers

    What must be manually changed to restart inspection after FortiGate exits conserve mode when av-failopen is set to 'one-shot'?

    <p>av-failopen</p> Signup and view all the answers

    How many settings are there for controlling how FortiGate handles traffic that requires proxy-based content inspection during conserve mode?

    <p>2</p> Signup and view all the answers

    What action does FortiGate apply when av-failopen-session is enabled?

    <p>Processes existing sessions</p> Signup and view all the answers

    What is the purpose of the 'config system global' command?

    <p>Control FortiGate behavior</p> Signup and view all the answers

    What is the purpose of the 'diagnose debug crashlog read' command?

    <p>View crash log</p> Signup and view all the answers

    By default, FortiGate blocks new sessions for which type of inspections?

    <p>Proxy-based inspections</p> Signup and view all the answers

    What governs FortiGate behavior for flow-based inspection while in conserve mode?

    <p>IPS failopen</p> Signup and view all the answers

    When does nTurbo not work on FortiGate with mixed UTM profiles using proxy-based inspection?

    <p>When flow-based inspection is enabled</p> Signup and view all the answers

    What happens when IPS fail-open is enabled on FortiGate?

    <p>The IPS engine allows new packets</p> Signup and view all the answers

    How can you identify if a FortiGate device is currently in conserve mode?

    <p>Use the command diagnose hardware sysinfo conserve</p> Signup and view all the answers

    When does the kernel delete the oldest sessions on FortiGate?

    <p>When there is not much available memory</p> Signup and view all the answers

    What types of sessions are categorized as ephemeral on FortiGate?

    <p>Both TCP and UDP sessions</p> Signup and view all the answers

    What does FortiOS set a limit on to protect memory use?

    <p>The total number of ephemeral sessions</p> Signup and view all the answers

    What should you do to optimize memory use on FortiGate?

    <p>Disable features that are not required</p> Signup and view all the answers

    Which type of inspections does the default FortiGate configuration apply to?

    <p>Proxy-based inspections</p> Signup and view all the answers

    Study Notes

    Conserve Mode and FortiGate Behavior

    • When the GUI is unresponsive in conserve mode, the crash log can be viewed on the CLI.
    • The av-failopen-session setting governs FortiGate behavior for proxy-based inspection while in conserve mode.

    AV-Failopen Session Settings

    • The default setting for av-failopen-session is 'off'.
    • When av-failopen is set to 'off', new sessions that require content inspection are blocked.
    • The purpose of the av-failopen-session setting is to control how FortiGate handles traffic that requires proxy-based content inspection during conserve mode.
    • There are three settings for controlling how FortiGate handles traffic that requires proxy-based content inspection during conserve mode.

    Conserve Mode and Inspection

    • When av-failopen-session is enabled, FortiGate applies a fail-open policy, allowing traffic to pass through without inspection.
    • When FortiGate exits conserve mode, the av-failopen setting must be manually changed to 'one-shot' to restart inspection.

    FortiGate Commands

    • The config system global command is used to configure global settings.
    • The diagnose debug crashlog read command is used to read the crash log.

    Default FortiGate Behavior

    • By default, FortiGate blocks new sessions that require proxy-based inspection.
    • The av-failopen setting governs FortiGate behavior for proxy-based inspection while in conserve mode.

    nTurbo and UTM Profiles

    • nTurbo does not work on FortiGate with mixed UTM profiles using proxy-based inspection.

    IPS and Conserve Mode

    • When IPS fail-open is enabled on FortiGate, the device allows traffic to pass through without inspection.

    Conserve Mode Identification

    • You can identify if a FortiGate device is currently in conserve mode by checking the crash log.

    Session Management

    • The kernel deletes the oldest sessions on FortiGate when the device is low on memory.
    • Ephemeral sessions are categorized as sessions that are less than 10 minutes old.
    • FortiOS sets a limit on the number of sessions to protect memory use.

    Optimizing Memory Use

    • To optimize memory use on FortiGate, you should limit the number of sessions.

    Default FortiGate Configuration

    • The default FortiGate configuration applies to flow-based inspections.

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    Description

    Test your knowledge on how to diagnose and debug FortiGate conserve mode logs. Learn about crash log entries and how to access them via the CLI.

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