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Odd issue with internet access

alxl29

Hi,

I did several research and looked everywhere in the firewall, but I was not able to find an answer to my problem. Basically:

- I have an XGS126w with the latest OS

- The setup is fairly simple: 1 LAN on a private /24 subnet --> The Firewall --> Internet connection via the internet provider's gateway

- I set up a MASQ rule and ACL rule for the /24 subnet to access the internet, and but I still have no internet access

- However, as soon as I ping an internet target (like 8.8.8.8) from the firewall (Diagnostics -> Ping -> Ping 8.8.8.8 from my LAN interface), then the internet access starts working from my LAN.

- A few hours later, the LAN->internet access stops working again, and I have to ping an internet target from the firewall diagnostics tools again...

Did anyone see this issue before? I assume something happens when I ping 8.8.8 from the firewall, and I need to configure that thing in the firewall, but I can't figure out why... I'm happy to provide screenshots of my configuration if needed.

Many thanks for your help.

Alex



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  • 0

    Are additional devices connected directly to the ISP router?
    (parallel to firewall)

    There is no PPPoE in use on the firewall?

    A constant ping from the LAN device to 8.8.8.8 changes the behavior?


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

  • 0 in reply to dirkkotte

    Hi Dirk,

    It's the only connection we have to the ISP router, and there is no PPoE setup on the firewall.

    The outside interface is a straightforward static IP with the ISP gateway.

    Thanks,
    Alex

  • 0 in reply to alxl29

    Sounds like your isp might be running a dhcp type function on your static address.

    ian

    XG115W - v20.0.3 MR-3 - Home

    XG on VM 8 - v21 GA

    If a post solves your question please use the 'Verify Answer' button.

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