OracleLinux 7: No IP for NAT network after 1st boot

[Rendanic]

Version

current master

Environment

Windows 10 with Packer, Vagrant and VirtualBox as build host.

Scenario

Building a Oracle Linux 7 VM with packer.

Steps to Reproduce

packer build -only=virtualbox-iso.vm -var-file=os_pkrvars/oracle/oracle-7-x86_64.pkrvars.hcl packer_templates/

The build for CentOS7 works fine:
packer build -only=virtualbox-iso.vm -var-file=os_pkrvars/centos/centos-7-x86_64.pkrvars.hcl packer_templates/

Expected Result

VM should get an IP from DHCP network on NAT network after 1st boot.
I can workarround the problem by manually starting the dhclient in the machine.

Actual Result

SSH connect from packer build run in a timeout, because the VM does not have an IP and SSH is not reachable via the port forwarding on NAT Device in VirtaulBox.

[Stromweld]

OL-7 is EOL and isn't supported anymore.