trimix
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ordex
To rephrase, you want your OpenVPN server host to act as a router connecting 4 networks:
1) the VPN
2) 10.0.0.0/24
3) 10.0.200.0/24
4) 10.0.250.0/24
You say that 1 can talk to 2, but 1 cannot talk to 3 or 4.
For two networks to talk to each other you need:
a) on the first network a route to the second one
b) on the second network a route to the first one
c) the router between the networks (OpenVPN host) to allow forwarding of traffic
Point c) is probably ok because your host can already forward traffic from 1) to 2) - but you should double check.
Regarding network 3) [network 4 is basically the same]:
a) do clients on the VPN have a route towards it? i.e. are you pushing the related route?
b) do host in the 10.0.200.0/24 network have a route towards the VPN network? Note that this can also be a default route to the "router" (OpenVPN host), but it depends on your setup.
If the two points above are not properly configured, packets cannot flow between the two networks.