100M full duplex

[jsheriony]

we have a new line, the carrier DSU is 100M full, we set the router to auto but it becomes half.

it doesn't go up when you change it to half or full.

Any suggestions what the cause might be?anything missing?Please advise.

Thanks

[Lucien Avramov]

This is puzzling, are you sure that the carrier is really giving you full duplex 100? I would have a doubt as auto does not let it on full duplex.

[jsheriony]

Assuming the carrier DSU is 100M full, what do you suggest?