Internet distribution for 20-25 devices?

Question

WiFi

Good afternoon!
Please help in choosing a solution for distributing the Internet via wi-fi for 20-25 users. The question, perhaps amateurish, is itself a little far from administration and the available experience is not enough to make an adequate choice.
Given:
- ADSL modem router from Ukrtelecom, which receives the Internet and can distribute via wifi and lan
- about 15 active connections via wi-fi, 20-25 are expected
The task is to distribute the Internet to all clients via wifi, there is no way to pull the cable.
The current router stopped coping with the plan - when a new connection appears, approximately 6-8 in a row, a person cannot connect to the network, he writes “it is impossible to connect to the network”, while everything works for those who have previously connected. After 1-2 reboots of the router, the problem disappears and everyone can connect.
I googled the problem and came to the conclusion that the router is physically unable to process the new connection. If I'm still mistaken - please guide me on the right path - how to overcome the problem. On the Internet, it was advised to buy an access point, give it an Internet from a router via cable, and from it already to all users.
Actually, the advice of knowledgeable people is needed:
1) is it possible to solve the problem without buying new devices? if there is a chance, I will clarify the details on the equipment
2) if you need to buy something, what exactly and how best to organize the distribution scheme?
The budget is limited. The ability to issue a separate connection to a certain number of clients (in the sense of 3-5 users go under a separate password) and limit the channel for specific connections is not critical, although if there are budget options with such capabilities, it will be super.
Thanks for the help!

Answer 1

This option is quite suitable for you MikroTik RB751U-2HnD

Answer 2

If the modem is provided by Ukrtelecom, try asking them.
If it is buggy and the manufacturer does not have a new firmware, then it will not work without additional purchase of equipment.
That is, either replace the ADSL router with another, better one, or buy an access point to it.

Answer 3

For 25 clients, it is better to use a multi-channel router with external antennas:
- routerboard.com/RB2011UAS-2HnD-IN
- zyxel.ru/keenetic-ultra
- www.tp-linkru.com/products/details/?model=TL-WDR4300
- Asus RT-N16 or N66U?

Answer 4

In a cafe we ​​distribute the Internet through asus rt-n66, 30-40 users are online without problems, more have not come yet :)

Answer 5

On the Internet, it was advised to buy an access point, give it an Internet from a router via cable, and from it already to all users.
all the same, all traffic will go through the "weak" Ukrtelecom router. essentially the same routing.
as an option, make a bridge out of it and pass all traffic through to the point.

Answer 6

To begin with, given that after several reboots it is possible to connect, I would suggest checking the DHCP settings of the existing router. Isn't the allocated address pool too small? How many addresses are available in DHCP?
In general, it would be nice to clarify the model of the router or at least some identification marks, in addition to the fact that it was issued by Ukrtelecom. It is quite possible that if this is a popular model, it will be possible to get by with a firmware update from the manufacturer and competent settings. 20-25 users is not such a big load, especially since in the case of ADSL we are clearly not talking about the highest speeds (for adsl2, 24Mbps for reception, no more than 1.5Mbps for upload - this is under ideal conditions) , so it can handle it.
Well, you can already think about the routers proposed above after that. But to fence the garden in the form of a separate access point connected after this router, I think it’s not worth it. The more complex the system, the more places it can fail.