[KLUG Members] OpenVPN & DHCP

[Adam Tauno Williams]

> I'm getting very close to testing an OpenVPN setup, but have become
> stumped at the server config.

Perhaps a little ASCII art would help clarify this for us.

> 1. How can I limit the OpenVPN server to a DHCP range subset when
> another DHCP server exists on the LAN?
> Current DHCP server serves range x.x.x.100 to x.x.x.175
> I want the OpenVPN server to use x.x.x.76 to x.x.x.200

You can bind a DHCP server to only listen on one interface, that is one option.
 But you're probably bridging the OpenVPN (tap?) interface and the ethernet
interface?

> 2. The above config line also sets the OpenVPN server at x.x.x.1
> But the current DHCP server is at that address.  The OpenVPN server
> already has it's own address on the LAN, will it assume another one as
> the VPN server?  If so, how do I set it so it won't conflict?

Not quite following the question.  The tap interfaces with OpenVPN are usually
bridged to the ethernet interface,  unless a recent version of OpenVPN added
proxy-arp support.