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XG 125 WAN Full-Duplex not working

I just purchased a XG 125 and have been working to configure it with my ISPs settings. I have it mostly up and running, but need to force the WAN interface to 100Mb Full-Duplex instead of auto-negotiate. As soon as I change it to Full-Duplex, the interface shows an 'Unplugged' status and I lose connection to my ISP, even though it is still connected. Is there something else I need to update to run the WAN interface in Full-Duplex mode?

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0 sachingurung over 8 years ago

Hi,

The preferred negotiation mode is Auto. Is the ISP line deployed through an intermediate modem/router to the UTM? In that case, if the modem is not capable of negotiating on the configure duplex, the negotiation attempts can fail and result in disconnection.

You can also check on what duplex is the modem configured.

Thanks

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
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0 sachingurung over 8 years ago

Hi,

The preferred negotiation mode is Auto. Is the ISP line deployed through an intermediate modem/router to the UTM? In that case, if the modem is not capable of negotiating on the configure duplex, the negotiation attempts can fail and result in disconnection.

You can also check on what duplex is the modem configured.

Thanks

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
Remember to like a post. If a post (on a question thread) solves your question use the 'This helped me' link.
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0 JedediahCarr over 8 years ago in reply to sachingurung

Thanks for the quick response!

My ISP (Cogent Communications) requires us to hard code the interface to 100 Full-Duplex and disable auto-negotiation. The circuit hand-off is Fast Ethernet, which is connected to my Sophos XG 125 running in Gateway Mode. There's nothing in between my XG 125 and Cogent's circuit.
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0 sachingurung over 8 years ago in reply to JedediahCarr

Hi,

In that case, can you deploy an intermediate unmanageable switch in between XG and the ISP line and set the negotiation speed as required.

Hope that helps :)

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
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0 JedediahCarr over 8 years ago in reply to sachingurung

I'm not sure how inserting an unmanaged switch would help though. To set the speed on the switch, it would need to be managed, right? Do the XG line of appliances not support changing the port speeds to 100 Full?
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0 sachingurung over 8 years ago in reply to JedediahCarr

Hi,

XG supports changing the port speed negotiation, deploying an intermediate switch will manage the speed negotiation at 100 Full between ISP and XG appliance. You don't have to manage the port speed on unmanageable switch they are by default set to 100 full. The deployment is simple you just need to plug and play.

Thanks

Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
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