Thanks for all of the advises ,but I'll need some time to figure it out what exactly do I need.The problem is that I knew nothing bout routers except for some theory ,cause I've never worked with one.But that certainly will be the next step in getting deeper in networking.Prices u mentioned are really low and u can't find a piece for this money except if it was produced in USSR(it should be really old).We have no rebates so far.I was in the states last summer but it was time i didn't need one.What do u suggest for home use of just 1-2 pcs.
As for the connection I have no DSL modem but a standart 'Realtek RTL8139 Family PCI Fast Ethernet NIC'.That's why I'm not sure what to do and how is my connection really set.LAN settings are as follow: IP address and mask that are aways on.PPPoE settings are changed everytime I connect.The problem as I see it(not sure) is that I have to add the service-name and access concentrator in one or another linux file but don't know where.