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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

    Hello Matthias,

    Thank you for contacting the Sophos community!

    This link shows the supported SFP modules https://support.sophos.com/support/s/article/KB-000037169?language=en_US

    For issues related to SFP you can check the /log/network.log module and DGD.log

    Regards,

     
    Emmanuel (EmmoSophos)
    Technical Team Lead, Global Community Support
    Sophos Support Videos | Product Documentation  |  @SophosSupport  | Sign up for SMS Alerts
    If a post solves your question use the 'Verify Answer' link.
  • 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.

  • 0

    Today I had a call with the VDSL modem manufacturer ALLNET and he gave me some hints to look for:

    • On longer distance use a quality LAN cable between the TAE and the SFP.
    • The SNR between the TAE socket and the DSLAM should be above 6db.
    • The ALLNET SFP VDSL2 modem takes a little more power than a "standard Gbit" SFP device. If there's not enough power, the voltage will suddenly drop and the connection is lost. Eventhough, the Sophos technical specs are addressing max 1,100ma with 3.3V, while the ALLNET consumes 700ma at 3.3V, the supporter on the phone spoke about 800ma. Nevertheless, the ALLNET specifications are within in the limits.
    • Last option, which only happened a very few times: The devices is getting too hot caused by a chip, which is place to close at the SFP port or by multiple SFP ports close to each other sharing heat.

    Before calling the Telekom service line tomorrow, is there any log a can head for to identify power errors at first?

  • 0 in reply to Matthias Gerhardt

    Hello Matthias,

    Thank you for the information.

    You can check the syslog.log and netword.log (to some extent). But there’s not a specific log for power errors.

    In any case, the adapter you mentioned doesn't seem to be part of the Supported SPF by Sophos. Do you have an SKU if any?

    Regards,

     
    Emmanuel (EmmoSophos)
    Technical Team Lead, Global Community Support
    Sophos Support Videos | Product Documentation  |  @SophosSupport  | Sign up for SMS Alerts
    If a post solves your question use the 'Verify Answer' link.
  • 0

    The Allnet SFP modem is having the SKU 141114.

    The product web site is located at: https://www.allnet.de/de/allnet-brand/produkte/neuheiten/p/allnet-all4781-vdsl2-sfp-switch-modul-mini-gbic-vdsl2adsl2-telco/

    When comparing both both modems, the Sophos and the Allnet, the Allnet exceeds the list of compatibility when supporting more standards:

    Sophos VDSL2 SFP modem: G.993.2, G.994.1, G.997.1

    Allnet ALL4781 SFP modem: G.993.2, G.994.1, G.997.1, G.998.4, G.993.5

    My ISP is providing G.993.5 with a VDSL 17a profile. I wonder, if the Sophos modem would be compatible at all for my broadband connection, which is labeled as G.993.5 / 17a.

    Nevertheless, we I can get a connection, which is not stable. So the from base point of view, it's working. Let's see, if we can get this thing running. :-)

  • 0

    Hello Community,

    now I have to confess, that I am little bit set up about my Sophos XG106. I have bought the very expensive Sophos SFP VDSL2 modem and the same problem of unstable connection comes up, a LCP timeout for no reason.

    Any advise would be good on this matter. Turning my private home network in a more secure place has cost me 600€ by now and I still have to rely on a FritzBox.

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