One internet connection -> 2 routers (2 networks)

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Hi guys,

I'd appreciate it if someone could help me with this networking issue I'm having.

I have an internet connection (static IP) connected to a Draytek router and I have quite a few computers running on it.
Now I want to connect a second Draytek router, to the first router so I can connect other computers (to the second router) on a different floor.
Basically, the connection is 20Mbit which I want to split in half, 10Mbit for every router.
The second router needs to be seen from outside as a different network. I don't want the computers from Network 1 to see the ones in Network 2, so two different networks.

I've tried connecting the routers (1)LAN to (2)WAN port, enabled VLAN on the first router, assigned a private IP/subnet mask for the second router and mapped it to public IP in NAT.
In the second router, WAN1 (ADSL) disabled; WAN2 configured for ethernet, set IP, subnet mask and the first router's IP as a gateway.

I'm not getting internet connection on the second router, I feel I'm missing something... tried to search for a solution online but haven't been able to find anything relevant.

I hope anyone reading this understands what I'm trying to achieve, makes sense in my head, explaining is something else...

Thanks !

 

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Vigor2830 both of them.

I need to have 2 routers; think of it as 2 different offices on different floors, each of them with their own (wireless) router; nothing in common except the internet connection.

 

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Thanks for the answers guys !