Multiples site to site tunnels

Hello all,
First of all, I apologize for my poor english…

I have 3 differents sites (1,2 & 3)
Site 1 ( has a site site to site Open VPN tunnel (server) with site 2 (
Site1 has also a site to site openvpn tunnel (server) with site 3 (
Site 2 and 3 can connect flawlessly to site 1
Is there a way to allow site 2 to see and ping site 3 using these tunnels ?
Actually I can access site 1 from site 2 via the tunnel but no way to access site 3

I don’t know if i’m really clear…

I would think this is possible since I do it across IPSec all the time. You need to make sure that site 2 has a route to the .73 network pointing to site 1 and site 3 needs a route to the .72 network point to site 1 as well.