Linux Site to Site Private

Scenio--Private VPN, going through internal networks. I have to design and impliment a solution using a VPN on an internal network. I have a group of Developers at Site A, that need to get to Site B. In between Site A and B is 2 internal networks, Lan A, which is a sister company and Lan B which is my my company. Both sites can get to site B, but I need to know how to setup how the Site A routes to B and vice versa. Lan A is a more congested than Lan B, also Lan A has more hops to Site B. I would like the VPN server at site A to use Lan B as the primary route and if that fails route through Lan A with out dropping connections. Can it be done? I would like to use a Linux solution. I also would like it switch back to the primary Lan A once the primary connection is restored. Any suggestions?

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Trillium Tech
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