OpenVPN Bridge Site-to-Site

[thialexvi]

Hi friends, greeting from Brazil :)

In my company, I have a link between two of our sites.
It is a bridged peer-to-peer connection between SiteA and SiteB totally transparent. All our main infrastructure is at SiteA:

MPLS <–-> SiteA <---> ISP peer-to-peer provider <---> SiteB

Even our DHCP server is at SiteA, and works fine, as if locally.

Trying to reduce costs with ISP providers, I'm looking for a replacement for one of our links. I already have pfSense in both locations serving another things.
So, I throught about OpenVPN and I followed some arcticles, etc... But I faced a problem.
Unfortunatelly I do not have access to manage our main (MPLS) routers, so I can't change it's routing tables.
So, the question is: Is it possible setup a link between both sites, using OpenVPN, without set my pfSense as client's default gateway? Is OpenVPN the right solution for my project?

I appreciate any kind of help on this :)

Thank you!

[kejianshi]

Openvpn will work fine there, but you will need to put the sites on separate subnets and run DHCP at both locations.  Separate subnets will not break communication between the two sides.  Thats my opinion anyway.