[ariestar]

I would appreciate help on this matter if anyone did something similar:
I have Private Internet Access VPN service, it's configured as L2TP in the WAN interface. By doing so it creates a new network, vlan2 that holds the actual WAN IP address.
In the top-right corner my WAN IP address is 10.0.0.2 or something similar, which is the internal IP on the PIA server. My actual WAN IP from the ISP is 82.x.x.x
There are two things that I want to achieve:
1) I want to be able to use the DDNS service with freedns.afraid.org. In the current configuration it picks up the external IP provided by PIA, something like 109.x.x.x. I want it to pick up my external ISP IP 82.x.x.x. How do I do this?
2) I want to expose an IP on my LAN to the ISP external IP, for example I have a server on 192.168.1.2 and I want be able to go to 82.x.x.x:80 and access the service on the server. If possible I would like to make this very flexible and expose all the INBOUND ports to that server. How do I do this?

Thank you very much for your help!

[Per Yngve Berg]

1) You have to use OpenVPN instead of L2TP.
Services->VPN tab

dd-wrt does not have a L2TP service.

2) will be fixed when 1) is corrected.

[ariestar]

Thanks for your quick reply.
The reason why I'm using L2TP (which actually works in the WAN interface configuration) is that my TP-LINK router has a limited 400MHz processor and by using OpenVPN I see an 80% speed reduction, which is too much.

Is there any other way?

[Per Yngve Berg]

Have you looked in the wiki?
"How do I access my modem"