From your output, I can see that the nas iface etho is ready to use the mode
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Supported link modes: xxx
xxx
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: xxxx
xxx
1000baseT/Full
But it fails to detect some other partners/hosts being able to support it
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Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
So it selects as speed 100MBits.
Check if you don't use a crossover cable.