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Sophos XG106 with Allnet ALL4781-VDSL2-SFP instable

Matthias Gerhardt

Hello community,

I am owning a Sohpos XG106 and the Allnet ALL4781-VDSL2-Modem. I plugged the device in, set it up as Gateway and entered the PPPoE credentials of my Telekom ISP including MTU 1492 and VLAN Tag ID 7.

The connection can be established and data can be received, Websites are opening.

After approx. 20 minutes, the modem disconnects and / or no data is transmitted anymore.

Has anybody experienced similar behavior? Is there something to look for?

I have tried three different TAE cable between the SFP-Modem and the telephone outlet. A FritzBox 7530 has no issues on the DSL connection.

The DSL Profile is 17a, which matches the specification.

Thanks for your support.



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  • 0 in reply to emmosophos

    I have set the XG106 Otto Factory settings and I can see in the logs, that I have timeouts on the LCP.

    At the moment, the values are:

    • Modem Allnet ALL4781
    • MTU 1492, MSS 1444
    • 100Mbps Full Duplex
    • VLAN Tag 7
    • LCP echo interval 5
    • LCP failure disabled

    Furthermore, the Gateway is marked red in the Routing section, but I could not identify any reason in the logs.

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