We are going to revive a post from the past… xD
As XRAYBoY said, the thing to do is use WDS, you take two routers that support it and one of them you put as the main one and the others as repeaters.
The main one in the WDS module of configuration, will have a list where you must put the MAC of each one, the routers have two MACs, the one of the wifi and the one of the router, I have tried WDS with the MAC of the WIFI, but logic tells me that placing the MAC of the router itself... should accept it without problems and work even if it goes by cable which is what the creator of the thread wanted in the first place.
So in summary I got very confused...
Main router, the one that has access to the internet. This router is put as WDS as the main one, and each MAC of the other routers that are going to work as a repeater is filled in, whether it is one, two or whatever.
It must be taken into account that you must put the MAC of what you are going to use, if you connect them by wifi, then the mac of the wifi, this one does not come on the sticker sometimes, but you have it in the wireless configuration.
Repeater routers, in these routers what you are going to do in the WDS menu is put the MAC of the main one and the gateway of the main one...
It is simple, the only thing to keep in mind is that you must put the same network name to all the routers and the same encryption.
In this way when you pass from one to another it does not disconnect, it is simply as if it were a single network, which it really is.
As the creator of the thread says, the advantage of doing it by cable between the routers is that no speed is wasted between them.
I messed around a few days ago with two linksys wrt54gl, I connected them by WDS and tried with just one how far it would reach with the laptop walking down the street... it reached up to 60 steps until the connection was lost... Well I separated the two routers 150 steps apart (I put the repeater on top of a wall at the end of the street with a car battery :ugly:) I did the test again doing a "ping-t" and at no time did it disconnect or do anything strange, so WDS is the simplest and "nicest" solution for this type of network to gain coverage.