Your old router is a free access point — use it

There is a router in the cupboard. The one from your last provider, or the one you replaced because someone said it was slow. Before you buy a mesh kit to fix one bad room, know this: that box can probably become an access point and close the dead zone for the price of a network cable.

Not always — and the checks below tell you in ten minutes whether your box qualifies. But when it does, it beats an extender, and it costs nothing but one afternoon.

What an access point actually means

Your old router is two machines in one box: a router (which hands out addresses and decides traffic) and a radio (which broadcasts WiFi). As an access point it stops being a router and becomes only the radio.

Picture a kedai makan with one counter. Queue gets long, people eat standing up. Open a second counter and the queue splits — but the boss still takes the money at the same till. The ISP box stays the boss; the old router just opens another counter closer to the far room.

That is why the setup below insists you connect cable to cable and switch off DHCP. Two routers both handing out addresses is two bosses arguing at the till, and the symptom is devices that connect but cannot load anything.

Check one: is there a cable path?

This is the whole decision, so answer it honestly before anything else.

Situation	Best option
A cable can reach the far room (trunking, along the floor, through the ceiling)	Old router as access point. Full speed, no loss.
No cable path, but the two rooms share a wall socket circuit	Powerline kit, then the old router behind it
No cable path, and you want one WiFi name everywhere	Mesh, or accept an extender's halved speed

Cable is not just tidier. An access point on cable delivers the full speed of the line. An extender or a repeater listens to the WiFi and repeats it, so every message crosses the air twice — effectively halving what the far room gets.

Check two: does the box have an AP mode?

Open the admin page — usually 192.168.0.1 or 192.168.1.1 in a browser, address printed on the sticker underneath — and look for Operation Mode, Wireless Mode or Access Point. If it is there, use it; the box configures itself.

No such menu? The manual route still works on nearly every router made in the last fifteen years.

The six-step setup

Reset the old router with the pinhole button, so no forgotten settings fight you.
Note your main WiFi name and password. Write them down before you touch anything.
Run the cable from a LAN port on the ISP box to a LAN port on the old router. Not the WAN or Internet port — that is the single most common mistake, and it creates double NAT: devices connect, then half of them cannot load pages.
Give the old router a fixed address in the same range as the main box but outside its pool. Main box 192.168.1.1 handing out .100 to .200? Give the old one 192.168.1.2.
Switch DHCP off on the old router. This is the step that makes it an access point rather than a rival.
Set the WiFi. Same name and password as the main network if both are dual band. Different channel from the main box: on 2.4GHz stick to 1, 6 or 11, and on 5GHz pick something far from what the main box already uses.

Then test in the far room: run a speed test on your phone, before and after. If the number barely moved, the bottleneck in that room was never signal strength.

The cause nobody mentions: the old router's radio

Here is the honest part. If the cupboard router is a single-band 2.4GHz unit, it is a coverage fix, not a speed fix. It will hold a video call in the far room; it will not feed a 4K television at the same time as three phones.

Two labels to check before you commit:

"10/100" on the LAN ports means roughly 90 to 95 Mbps is the ceiling for anything behind it, forever.
WiFi 4 (802.11n) only means busy moments feel sticky, because that radio can only talk to one device at a time.

If both apply, the box still has a use: put it in the far room for the devices that do not need much, and leave the fast devices on the main WiFi.

When not to bother

Skip it if the apartment is small and the far room already gets two bars. Skip it if you cannot run a cable and the alternative is a powerline kit that may or may not behave on old wiring. And skip it if the box is more than eight years old and only has 2.4GHz — at that point a cheap modern access point does the same job better.

Otherwise, an afternoon and one cable is a fair trade for a room that finally works.

Quick answers

Can any old router be turned into an access point?

Most can. Newer ones have an Access Point or Bridge mode switch in the admin page which does the whole job for you. Older ones without that mode still work if you connect LAN port to LAN port and switch off DHCP on the old router — that is the manual version of the same thing.

Should the old router use the same WiFi name as my main WiFi?

Same name and password only if both boxes broadcast on both bands, so your phone can hand over cleanly. If the old router is 2.4GHz only, give it a different name such as Rumah-2.4. A phone that keeps clinging to a weak 2.4GHz signal in the far room is worse than one you switch by hand.

Will adding an access point make my internet faster?

No. It fixes coverage, not speed. Your line speed stays exactly the same. What improves is the signal in that one room, and often the speed there too, because a strong signal at short range beats a weak signal through two walls.

My old router says 10/100 on the ports. Does that matter?

Yes, a lot. A 10/100 port tops out around 90 to 95 Mbps no matter what you pay for. On a slow line that is fine. On a fast line it becomes the slowest part of the chain, and every device behind that router is held to it.