Enquiry about upgrading from DSL router to Ethernet router

@kanewolf thanks i guess now i have to look for the possible ways mr Ralston18 suggested

@Ralston18 let me tell you the whole situation in detail :

First off all the reasons I'm upgrading to linksys E4200 are these :

1- The TP-LINK router is horrible, it's so old and it's making using the Internet feels like hell as it demands restarting the router more than once a day.

2- I need a router that i can install DD-WRT on it so that i can use later as a VPN client and use VPN on everything that routes via the router (for many reasons), and i put a lot of effort choosing a good router and i found a used E2400 in a very good condition for sale in my country online but it was coming from another country, and i find it fair enough as it has a cheap price and also it's a wireless-dual band and that's heavin comparing to my old TP-LINK, But the only thing that is keeping me from buying it till now is that ethernet input thing.


Now coming to our current situation and the possible solutions, this is it:


CURRENT SITUATION

ADSL caple from the street > Spliter -> phone line (goes to the phone network inside the house)+ ADSL line (goes straight to the router) -> TP-LINK [External ADSL2+ Router / Model number : TD-8810] that what exactly was written on it -> TP-LINK switch -> two separate access points


Now the possible solutions that i understood from you are these two:


1- ADSL Cable from the street -> Spliter -> ADSL line -> TP-LINK router that is working as a bridge -> linksys router that is working as a router -> whatever i want


2-ADSL Cable from the street -> a modem -> phone line (goes to the phone network inside the house) + Ethernet line (goes to the linksys router) -> linksys router -> whatever i want

If that was what you meant, then i have 4 questions for you :

1- why wouldn't the third solution that i imagine work? [ADSL Cable -> Spliter -> dsl to Ethernet converter -> linksys router]

2- how come that such an advanced router as E4200 (comparing to my TP-LINK) require a modem work, while the very old TP-LINK td-8810 doesn't require a one, and works directly with the adsl line?


3- will any modem do the job? Also will any router replace the modem and do the bridging stuff? As i will go with the cheaper one in case if they are as effective as each other (the modem and the router i mean)

4- will any of the modem or the bridging router affect my VPN process or make the connection slower? I mean if they will affect the connection badly i can change the whole E4200 router with a DSL router that can take the DD-WRT on board, because the main purpose is to run a VPN routed home network.

Thanks in advance, i really appreciate your time

@kanewolf yes i understand but can you read my previous comment and give me your precious opinion in the 4 questions in the end of it?

@kanewolf okay now i get it, i might go with a modem and the E4200 in the end, but it's very disappointing to know that VPN eats all that much of speed, i mean i read that it takes out 10 percent of the line speed as losses but with what ur saying that could turn out to be a bad idea specially that here in Egypt we have one of the slowest connections in the world with no kidding at all, my current speed is 2 mbps and i was going to raise it to 8 mbps before subscribing to a VPN providers, so maybe I'll stick with the E4200 as a powerful router with no VPN.

I'm really grateful for your time and your generous information on that specific topic, thank you very much really