Hi All, i’ve tried to use a picture to demostrate what I am trying to achieve:

So Site A is long established, and has connectivity to the vendor no problems.
When i VPN in from home to Site A i am able to access the application no issues.
What I am trying to achieve is create a site to site VPN and then route all traffic bound for the 172 addresss from site B across the VPN into site A which i hoped would then route the traffic out via the vendor VPN.
As a starting point for testing this I added a route on the site B SXT to say anything for 10.0.0.8/24 send via the VPN tunnel, but i can’t even ping that box, I just get TTL exceeded error.
Am I chasing the impossible dream here or should this be “doable” ?
Many Thanks