I have two routers set up for my home network. One is the primary router (which also serves as a modem). Running from a LAN port of this router is an ethernet connection to the WAN port of the other router which is serving as an access point in a bungalow out the back.
Both routers are Netgear DGN2200s, and the second router has been set using Access Point Mode (which I presume disables DHCP among other things). The manual suggests that connecting to the WAN port is necessary for this. The internet works fine in all cases.
The problem: If I have a laptop connected via WiFi on the primary router, and another connected via WiFi on the access point, sharing between them is problematic. i.e. Both are running Windows 10, but I cannot access shared folders between them - I will get a "Windows cannot access \\[other computer]" error when trying to access a shared folder. However they can share files fine if they are connected to the same router. Additionally, the sharing was also completely fine when I initially set up the routers - it only broke when I happened to restart the primary router.
Would greatly appreciate any help. I'm assuming this is likely to be a networking issue more than a Windows file sharing issue?