Use a Puck as a backup unit of an Element

I try to use a Puck unit as the Backup of my Element by without success. The Puck never see the Element as a Master on the network.

I use an Ethernet switch connected to the Element, the Puck and an ETC two ports gateway

- The two units use the EOS V2.3.3 software

-The two units have the Network card configured ( Ip 10.101.97.101 for the Element and 10.101.97.102 for the Puck)

- The two units have the SubNet Mask configured (255.255.0.0)

When I connect an ION with the same settings of this Element all the Backup functionalies are ok.

Is there a special setting or a special driver for the Element desk? 

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