Another research item:
Need to provide access through OpenVPN to the same LAN as where the OpenVPN server runs on.
This is unusual, and requires a bridged OpenVPN solution.
Jürgen Schmidt wrote a nice article on this in 2008.
Endian community edition seems to support this out of the box:
Server configuration
In this panel you can enable the OpenVPN server and define in which zone it should run.
OpenVPN server enabled
Click this to make sure the OpenVPN server is started.
Bridged
If you want to run the OpenVPN server in one of the existing zones check this box. ..
note:
If the OpenVPN server is not bridged you must set the
firewall rules in the VPN firewall to make sure clients
can access any zone - unless you do not want them to.VPN subnet
This option is only available if you disable bridged mode, which allows you to run the OpenVPN server in its own subnet that can be specified here.
Bridge to
If bridged mode has been selected here you can choose to which zone the OpenVPN server should be bridged.
Dynamic IP pool start address
The first possible IP address in the network of the selected zone that should be used for the OpenVPN clients.
Dynamic IP pool end address
The last possible IP address in the network of the selected zone that should be used for the OpenVPN clients.
–jeroen
via: The VPN Menu — Endian UTM Appliance v2.4 documentation.