Routing Guidance - Connecting 2 Routers

[pallys]

Hi, I'm hoping someone who is familiar with network routing can help me.
I'm specifically trying to connect 2 routers in different locations of my house and the clients on each router seeing each other's devices.

I've drawn the following diagram to help.

Problem 1: Devices connected to the Linksys router cannot see devices connected to the ADSL Modem router. However if I connect with my wireless laptop than I can see devices on both routers. It is as if with a wireless connection both routers are bridged together, but not if hard wired into the RJ45 ports.

Problem 2: My PC will only connect to the Linksys router if I add a 2nd homeplug to the router. I want to get rid of the 2nd homeplug on the Linksys because it doesn't make sense to me that 1 router needs 2 homeplugs.

I've setup a DMZ on the ADSL Router to connect the 2 routers but I think this is not the best way to connect the 2 routers. I want all my devices to see each other as 1 seamless network. ADSL router is connected to the WAN port of the Linksys WRT54GL.

I think I need to configure a static route but not sure in my assumption, or how to do it.
Here is my current routing table on the Linksys router (which has a tomato derivative firmware which is very similar to dd-wrt).

Some more settings:

Update: I want the Linksys Router to be master of the LAN, and the ADSL Modem Router to accept and share the internet and act as an access point including wireless. The ADSL Modem Router is a Technicolor TG 582n router from TescoBB.

 

[pallys]

@pallys
Sorry, somewhat unrelated, but I'm looking for a new router with good QoS / Bandwidth limiting..
Is it possible to limit an individual device with that firmware you're using? i.e. wifi devices less than 40kb/s maximum download etc etc.

Yes.

Switch required not a router. Is there a reason why you require another router?

Don't understand why you have the second router - why not just a switch?

Also, had a look at this dummy tomato GUI here: http://victek.is-a-geek.com/virtual/tomatok26/basic-network.html

Can you set WAN/Internet to disabled and then 'Use WAN port for LAN'? Then disable DHCP on the tomato router and clients on Router2 should get their IP from Router1 - essentially turning Router2 into a wireless AP/switch

I've just realised that I want the Linksys router to control the LAN and give out IP's because with the tomato firmware it allows me me control/monitoring that my rubbish ADSL Modem/Router from TescoBB doesn't do. I also still need wireless enabled on both routers because of coverage, the Linksys won't each all the rooms upstairs.

I don't have the use 'WAN port for LAN', but I think I can use that from the VLAN area on my firmware below.

I really need the ADSL Modem/Router to still take the ADSL line but become a switch, so that everything connected to it is seen as a connected device on the Linksys which I want to be the master of the LAN so to speak so I can use its advanced features like BW throttling/monitoring. (homeplugs are all the same model).

Is this possible? If so point me in the right direction and I'll have a play with the settings. The ADSL Modem Router is a Technicolor TG 582n.