Company A & B merged. Company A has Server Farm as 10.2.0.0/22 address space. Company B has Server Farm as 10.3.1.0/24 space. However Company B's remote Sites fall within the 10.2.0.0/22 space. Company A & B are connected using VPN tunnel. Company B's remote site use this VPN tunnel (remote site >>mpls >> company B rtr >> firewall).
Short term goal is to have Company B's remote site access A's Server Farm (traffic will only be flowing from remote sites to Servers and never in reverse).
Solution I have proposed is to have a NAT router sitting at Company A site b/w the server farm and Firewall.
1. All traffic b/w "B" Server farm and "A" server farm not Natted. All traffic between B's remote will be source NATTed to 10.100.1.0/24 space and all A's destinations will appear at these remote sites (using the NAT router) as 10.101.1.0 (Static 1 to 1 NATs). Does anyone see any issues with this setup, considering the NAT router in question will be doing static NAT as well as routing.