11 Mb/s = ~100mbps 😉
The cable, port and router are gigabit: i replaced, in the same place with same cable and same router, the old nas (that worked in gigabit mode) with this one!
The router recognizes the hp port as gigabit! The cable is gigabit, only in synology i read 100mbps (under Control Panel -> Network -> Network inteface -> LAN 1 -> Network Status) and, obviously, the maximum speed reached is 11/12 mb/s
Before, during installation, I was in another place NEWS
I SOLVED WITH SSH:
ethtool -s eth0 speed 1000
or
ethtool -s eth0 autoneg off speed 1000 duplex full
Thanks