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TZ 370 Flapping on X1

We have a TZ 3700 with firmware SonicOS 7.0.1-5051 which is flapping on X1 for between 2-3 seconds hundreds of time a day. The internet connection cuts out on video meetings.

We have a pppoe connection with static IP.

We have:

changed the modem ,

changed the cat 5 cables,

changed the MTU to 1492

the problem persists.

HELP !!!

Category: Entry Level Firewalls

Best Answers

  • Options
    MarkDMarkD Cybersecurity Overlord ✭✭✭
    Answer ✓

    looks like it could a physical issue with the interface.

    For 1Gb use auto/auto for 10/100 set the speed and duplex to match the upstream device.

    You could change the X1 to another physical interface to determine IF its a hardware fault

  • Options
    BWCBWC Cybersecurity Overlord ✭✭✭
    Answer ✓

    @JWBDH it might be the all time classic, could you try to put a mini switch between X1 and your Modem? This solved port flapping for a lot of us. SonicWall never answered the question why this happens but if a 10$ switch solves the issue I honestly don't care anymore.



  • Options
    JWBDHJWBDH Newbie ✭


    Since I put a switch between the X1 and Modem it has not flapped once in 5 hours vs 5 times an hour!

  • Options
    JWBDHJWBDH Newbie ✭
    edited March 2

    @sonicwall is there ever going to be a long term fix to this flapping? We purchased your appliance not to place a $10 switch between your device and the modem, It only adds another point of failure!

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