DHCP only on wrt router


Quick overview, i have a router on that serves my wifi, i have openwrt on another router on that is running VPN. Im trying to accomplish anything that is plugged into the router( or connected over wifi to serve DHCP. if something is connected to my modem lan or other router( for that to serve dhcp for that device.

Openwrt is handing out address across the whole LAN on both subnets. is there a way to isolate dhcp only on that single device?

Probably you need to use static leases and/or individual options.

This should be the default behavior, if you plug the main network into the WAN port of the secondary router. Perhaps you configured the secondary router as a dumb AP?