WAN and LAN on WAN Port

[bilboSNB]

C'est possible?

I have only one ethernet cable running upto the location of my router on upper floors, is is possible to get it to function as a full router from there whilst still feeding the rest of the wired network lan?

Modem connects into a managed? switch at ground, then connects to the router wan on upper floor for pppoe. There is another dumb switch connected to the router switch on the upper floor and the lower floor switch feeds the rest of the lower wired network. Is this possible?

At the moment I have the router upstairs in ap mode as best wifi coverage and I want to decommission a router I have downstairs.

 

[ColinTaylor]

What is the speed of your internet feed? If it's not too high perhaps you could use a pair of powerline adapters to link the cable modem to the router's WAN port. That would leave the Ethernet cable free to be a LAN connection back down to the lower floor switch.

Another horrible alternative would be to split the Ethernet cable (assuming it's Cat 5e/6) at each end so that it provides 2 independent 100Mbps links, one for the WAN and one for the LAN. But like I said, horrible, and would require a certain amount of spicing and rewiring.

EDIT: Actually it looks like you can get ready-made splitters. http://uk.rs-online.com/web/p/rj-adapters-couplers-extensions/4439165/

 

[bilboSNB]

Thanks for the powerline idea, I hadn't thought f that, speed is 60 down at present supposed to be automatically upgraded this week as VDSL vectoring is getting switched on so might see up to 100.

I was thinking more about some vlan solution though.

 

[bilboSNB]

Reading about I think I can do it with a couple of managed smart switches without any special config on the Asus.

However can I turn the wan port into a wanlan trunk if needed and how? If I did this would it mess with policy routing trend etc?