DD-WRT OpenVPN with multiple VLANs

ComputerCarl

I'm new to this so please go easy on me. I'm using OpenVPN Server with DD-WRT. I can configure the server in Bridge (Tap) mode and access the VPN without issue. Problem is, this just gets me onto the first LAN (VLAN 1) which is the management LAN. I (myself and other clients) want to be able to access VLANs 4, 5, & 6 via the VPN. VLANs 4, 5, & 6 are our staff networks for different departments, and are where all our file shares and other resources reside. The subnets are setup as follows:
VLAN 1 (management) - 172.16.1.1
VLAN 4 (Staff dept 1) - 172.16.2.1
VLAN 5 (Staff dept 2) - 172.16.4.1
VLAN 6 (Staff dept 3) - 172.16.6.1
VLAN 7 (Guest, do not want/need access to this VLAN) - 172.16.8.1

As I said, I can access the management VLAN no problem. When I switch the server mode in DD-WRT to Router (TUN), I am unable to connect at all to the VPN. I'm sure I need to make some manual entries somewhere, but I am not sure. Can someone please give me some guidance and direction?

Thanks in advance!

TinCanTech

See HOWTO: Expanding the scope of the VPN to include additional machines

ComputerCarl

TinCanTech wroteSee HOWTO: Expanding the scope of the VPN to include additional machines

Checking it out now. Thanks.

ComputerCarl

TinCanTech wroteSee HOWTO: Expanding the scope of the VPN to include additional machines

Forgive my ignorance, but I've read through the instructions in the link you provided, but I didn't read anything in there about connecting to multiple VLANs. Again, I'm new to this, so I'm sure that I probably just overlooked it, but I'm still in need of help. Anyone that can help me out with some instructions will be greatly appreciated.

ComputerCarl

I'm sure that all I need to know is the proper commands to type/paste into DD-WRT, but I don't know what those proper commands are. I've spent countless hours reading over the past couple of days, but I think I'm more lost now than when I started.

TinCanTech

ComputerCarl wroteProblem is, this just gets me onto the first LAN (VLAN 1)

First problem .. OpenVPN does not provide support or integration with VLANs. So you will have to ask DD-WRT support for details on that.

However:

ComputerCarl wroteThe subnets are setup as follows:
VLAN 1 (management) - 172.16.1.1
VLAN 4 (Staff dept 1) - 172.16.2.1
VLAN 5 (Staff dept 2) - 172.16.4.1
VLAN 6 (Staff dept 3) - 172.16.6.1
VLAN 7 (Guest, do not want/need access to this VLAN) - 172.16.8.1

As I said, I can access the management VLAN no problem. When I switch the server mode in DD-WRT to Router (TUN), I am unable to connect at all to the VPN

With --dev tun you are essentially trying to setup routing for subnets on the server side. That link I provided shows the steps you need to take to configure OpenVPN to provide the required routing. Be aware, openvpn only provides the linkage between end points and a mechanism (--route) to configure those end-points to support the desired routes. But this does not cover any further requirements outside of the openvpn environment. By the sound of your initial post, you need to learn how routing works and how to configure routers and other services to support this.