How can I access devices on a second router on the network?

• Router1: I have an ISP provided modem/router.
• Router2: I have another router (which I cannot install DD-WRT on).

Router2's WAN port is connected to a LAN port on Router1 and I use Router2 to connect to a VPN using a PPTP setup. All devices connected to Router2's WiFi will get internet access through the VPN. All devices connected to Router1 will get normal internet access.

The problem is that I cannot access SAMBA shares of devices on Router2 from devices on Router1.

Is there a way to achieve this?

Instead of connecting the WAN port on router 2 to the LAN port on router one, connect router via the LAN port as well and that should resolve the issue. Also, make sure only one router is acting as DHCP server, if both are, they will be on different subnets.