WAN redesign

*** Please see network diagram ***

We currently have 4 location (3 in the US, and data center in India)
All locations are currently connected using MPLS (3 Mb) but the contract is ending soon

A. (Data Center in the US) has a Sophos UTM (Firewall) with a VPN tunnel connected to D(India data center)
     and has fiber (150/150) and cable connection (16/3)
B. (Corporate) currently has a cable connection (75/15)
C. (Remote Location) currently has a cable connection (100/7)
D. (India Data Center) "hosted" our ERP program server  and email server

Other then "private networks" (ex: MPLS) and VPN tunnels, via internet connections, are there kind of emerging technologies for WAN connectively?

At corporate(B), we want to have "high availability" to the India data center (D). As the diagram shows, if US data center (A) loses connective, then corporate (B) would also not be able to connect to our ERP or email. Can this be done with by adding something other then a firewall at corporate (B). Note: All internet traffic flows thru US data center(A), for monitoring, which is the reason right now for not connecting corporate (B) directly to India data center (D) via VPN tunnel

Would a mutli - WAN router work for any of this?
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Kaiser AnwarCommented:
The issue I see is a single VPN to India and should  be configured with the backup VPN peer just in case the primary one goes down
brtl1000sAuthor Commented:
Actually, a VPN tunnel has been created using the Fiber IP address and the Cable Modem IP address. According to my support team in India, both cannot be "up" at the same time.
Find better firewall/ vpn device. VPN in commodity OS-es like Windows server or Linux supports failover included in base price.
From my understanding, there exists VPN configuration from US Datacenter to India Datacenter over both the fiber and cable connections, but only one is active at a time. That is fine.

The corporate office needs to have redundant internet to start with. I have no experience with the Sophos RED devices, but it doesn't look like they cannot connect to the Palo Alto in India. You probably need a Sophos firewall or other device to be able to make a VPN connection directly to both datacenters.

There are  companies that are able to aggregate bandwidth from multiple carriers. I am not sure how they work to protect private data over public networks.

http://www.fatpipeinc.com/ - I am pretty sure they can handle your private network traffic.

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