jerome_itable Lv2Posted 17 Jan 2024 08:15
  
A Sangfor NSF firewall experiencing frequent WAN PPPoE public address changes upon connection and disconnection can be caused by several factors. Here are some potential reasons and troubleshooting steps:

Possible Reasons:

    ISP Configuration:
        Dynamic IP Allocation: Your internet service provider (ISP) might assign dynamic IP addresses through PPPoE, leading to frequent changes.
        Lease Timeout: The assigned IP address lease might have a short expiration time, triggering automatic renewal and change.

    Firewall Configuration:
        PPPoE Reconnect Settings: The firewall's PPPoE reconnect settings might be overly aggressive, causing frequent disconnects and reconnects with new IP addresses.
        DNS Dynamic Update: If enabled, dynamic DNS updates based on the changing IP address can further complicate troubleshooting.

    Technical Issues:
        Modem Instability: Faulty or unstable modem hardware can trigger disconnects and reconnects with new IP addresses.
        Network Congestion: Heavy network traffic might lead to temporary connection losses and subsequent re-establishment with new IPs.

Troubleshooting Steps:

    Verify ISP Configuration:
        Contact your ISP to confirm if they assign dynamic IP addresses through PPPoE.
        Inquire about the IP address lease duration and renewal process.

    Review Firewall Settings:
        Access the Sangfor NSF firewall's web console.
        Navigate to the PPPoE configuration section.
        Check the reconnect settings and adjust them if necessary. For example, increase the reconnect interval to avoid overly frequent attempts.
        Disable dynamic DNS updates if not required.

    Investigate Technical Issues:
        Check the modem's logs for any error messages or disconnection events.
        Consider restarting the modem or contacting your ISP for further technical assistance.
        Monitor network traffic to identify potential congestion issues.

    Additional Tips:
        Document the observed IP address changes and their timestamps for further analysis.
        Consider setting up static PPPoE configuration with your ISP if consistent IP address access is crucial.
        Consult the Sangfor NSF firewall documentation or contact Sangfor support for specific troubleshooting guidance based on your model and firmware version.

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