IP removed when VM is started.

[Katagia]

Hello

I'm using TrueNAS 12-U2.1 with an interface ix0.
This interface shall have 2 ipv4 IPs, one fixed IP and one via DHCP.

Setup was very easy. Under Network -> Interfaces I selected the checkbox DHCP and in IP addresses I added the static IP.
ifconfig confirms that both IPs are set.

I have a linux VM.
Device type of the NIC is set to E1000. It is attached to ix0.
As soon as the VM is started the static IP is removed from interface ix0

Has anyboday an idea what might went wrong?

Thank you very much.

 

[Katagia]

For the records:
I have to set the option "disable hardware offloading".
I don't have performance drawbacks when the option is set.