Port mirroring and Promox

Hello Everyone.

I am trying to setup a port mirroring with proxmox.

My Proxmox server has two network card, and I would like to use the second network card has a miroring port, the server is connected a managed switch which can do port mirroring.

I would like to use the switch mirroring port capability to setup a VM with OSSIM which will analyse the traffic with the second network card connected to it?

Is it possible because when I try to create a new switch with eth1 I can't because the gateway already exist.

How can I send all the traffic from the second ethernet card to the OSSIM VM?

Thank you in advance,

Best regards,

N3ST