LAN routers in two datacentres 3 different subnets

Question

I have two LAN routers in two datacentres with a private connection joining them. I am trying to communicate from one datacentre to the other but haven’t been able to get the rules/routes sorted. The details are as follows:

(Datacentre 1) 172.16.5.X/24 (GW: 172.16.5.254)<-> 172.16.0.1/30 <-> (Datacentre 2) 172.16.0.2/30 <-> 172.16.6.X (GW: 172.16.6.254)

I can ping 172.16.6.254 from Datacentre 1 and can ping 172.16.5.254 from Datacentre 2. I can tell by the ping duration that the traffic is moving between the datacentres but cannot ping 172.16.6.1 from Datacentre 1 or ping 172.16.5.1 from Datacentre 2. Configuration screen shots are as follows:

Datacentre 1

Datacentre 2

Any assistance would be appreciated. Thanks

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Allan Pumphrey · Accepted Answer

OK, Got it! I have removed the Policy Route and "gateway" from my previous change to revert it back to the configuration when I posted this question. Then as you said... I removed the "Interface" from the route and populated the "Gateway" with the IP from Datacentre 2 172.16.0.1 and its now working. Thanks for so much... made my day! 
 
 Datacentre 1's Route is shown below

Björn Ebner · Answer

Hi there, 
 to determine if everything is configured correctly, the configured Gateways would be helpful. 
 
 What you could try to do is the following (without knowing the configured Gateways): 
 Datacenter 1: 
 Change your Interface Route to Gateway Route with the following Gateway: 172.16.0.1 Disable MASQ in your Rule 
 Datacenter 2: 
 Change your Interface Route to Gateway Route with the following Gateway: 172.16.0.2 Disable MASQ in your Rule