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Welcome!- What Hardware version is your router? Look at sticker under router.
- Link>What Firmware version is currently loaded? Found on the routers web page under status.
- What region are you located?
It's preferred that you would need to have the same IP address pool and sub net to communicate and not be on a different pool and subnet. If you need to be on different pools and subnets you'll need a different class router to handle the routing between LANs.
I recommend phone contacting your regional D-Link support office and ask them specifically if the 605L an router between LANs and if not, what specific model router can? Please ask them about a DSR series class router.
The DIR series class router is a home and small office kind of router with limited routing abilities and not meant for larger business class environments.
Let us know what you find out.