1:1 NAT with several identical LANs

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http://unix.stackexchange.com – I want to connect several LANs located on remote buildings. The "central" site have a Linux computer running OpenVPN. Each remote site also run OpenVPN. the central site has a LAN numbered several remote sites are also numbered I can't/won't/don't want to/whatever modify LAN numbering I don't have control on most remote OpenVPNs I then need to : 1. define virtual LANs 2. configure a 1:1 NAT for each site 3. the 1:1 NAT has to be configured on the central router . So each site is seen to have a 10.10.x.0/24 LAN. When a computer want to reach, say, 192.168. (HowTos)