[strongSwan] Routing between two remote sites

[VTwin Farriers]

I have 3 sites, East, Central, and West

Their subnets are 10.0.0.0/16, 10.64.0.0/16 and 10.128.0.0/16 respectively.

Both East and West connect directly to Central and route traffic between Central and each of the remote sites. e.g. both 10.0 and 10.128 can both talk to all machines on 10.64 and vice versa.

I cannot, however, figure out how teach 10.0 to route traffic to 10.128 through 10.64, so East and West can talk to each other's subnets. 

I cannot establish a link directly between East and West, they have to go through Central.

Help appreciated, thanks.

(this is running on Centos 8.5, all 3 sites.)
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