Technicolor CGA2121 w Multimedia Upgrade to 300Mbit - TP-Link WDR3600 Router Connection Issues

Hello everyone.
A few days ago I changed the Internet in Multimedia from 120Mbit to 300Mbit and therefore they replaced my modem with Technicolor CGS2121. Due to the fact that I use my own router, WiFi on the modem is blocked, which means it should work like a regular modem.
The problem is that I can't use the entire link. Connecting the modem directly to the computer works fine. i.e. the link speed test shows a download slightly above 300Mbit, which is as it should be, but e.g. the utorrent program throws an error

The modem should not block ports so what's the problem?
The second problem is bigger because in the end I also use WiFi so I use my own router but in this combination I only have a 120Mbit connection.
The modem is connected to the router with a LAN cable and from the router with cables to the computer and ZONK. I did not take a faster connection to continue using what I had, i.e. 120Mbit. I note that I did not block anything in the router, did not limit or share the bandwidth. Before replacing the modem everything worked fine. The router is a few years old, but I've had no problems with it. It works in two bands 2.4GHz and 5GHz 2x300Mbit for each band and 1GBit after LAN (in the specification there is info that above 800Mbit) so it should support this new 300Mbit link.
Can someone help me what the problem is?

Quick partial answer.
I'm not talking about the WiFi band, but about the connection on the computer via LAN. The fact that I have limited bandwidth on WiFi I can accept until I change the router, but on a desktop computer with a cable I should have a full connection. From the router and not only directly from the modem.

beringen wrote:

WiFi on the modem is blocked, so it should work like a regular modem.

No, it's still a modem router with NAT, firewall, etc. - so it's still a router, but it doesn't generate wifi anymore
If you want to turn Technicolor into a modem/bridge, you have to manually switch it to bridge in the client portal - only then will it become a modem.

TPLinks have such stupidity called bandwidth width or something like that - you have to set it there.
You also need to check the manufacturer's software for this model, if it is new, upload it (the last one from 2015).

beringen wrote:

over LAN 1GBit (in the specification there is info that above 800Mbit)

The old TPlink v1 1043ND also had 1Gb ports, it was also supposed to be able to pass NAT 940Mb, and it choked at 120Mb.
Your grandpa is:
CPU1: Atheros AR9344 (560MHz)
FLA1: 8MB (Spansion S25FL064KIF)
RAM1: 128MB (Hynix H5PS5162GFR Y5C × 2)

https://www.tp-link.com/us/support/faq/540/

After all, this TP-LINK is a soap dish, not a router for such a link. These 120Mbps is just what it can handle.

beringen wrote:

but e.g. utorrent throws an error

Because the operator's device works as a router, not a bridge (WiFi has nothing to do with it) and besides, you normally have a private IP address on the WAN interface, so you are behind double NAT. Torrent then won't work.
Solutions to your problems:
1. Set the soap dish to access point mode and it will be ok with the bandwidth: https://www.tp-link.com/pl/support/faq/417/
In short - connect to the TP-LINK LAN port and not to the WAN port, change the IP of the LAN interface and disable DHCP.
2. Buy a public IP from the operator, it will not be a problem with Torrents.

@beringen
For torrents to work:
- switch Technicolor to bridge mode,
- This TPLink cable from Technicolor for WAN, DHCP in TPLink for automatic,
- and a necessary condition, public IP from the operator.
Without the latter, whatever you do, the torrent will not connect.

KOCUREK1970 wrote:

- This grandpa under WAN, DHCP in it on automatic,

This grandpa can't be under the WAN, because he won't handle more than a hundred and several dozen Mbps.

IC_Current wrote:

This grandpa can't be under the WAN, because he won't handle more than a hundred and several dozen Mbps.

Well, the author has to decide whether he still works on his grandfather or buys new equipment.
Might even mess with the bandwidth width.
But as a rule, with the new router, it connects the same way as I advised above.

KOCUREK1970 wrote:

Well, the author has to decide whether he still works on his grandfather or buys new equipment.

He doesn't have to buy anything, all he has to do is put his grandfather in access point mode and bypass the main processor with NAT. Then performance will be ok.

IC_Current wrote:

He doesn't have to buy anything, all he has to do is put his grandfather in access point mode and bypass the main processor with NAT. Then performance will be ok.

beringen wrote:

after all, I also use WiFi so I use my own router

In addition, it will not forward ports on Technicolor itself, because it does not have access to the GUI.

Yesterday I went out and today as I see some answers have gathered and the more the more confusion.
I changed the soft in TP-link immediately after the purchase to gargoyle and increased the memory by plugging the pendrake into one USB. Soft is more efficient and has more possibilities because a media server and a regular camera as an IP worked on it, but that's off topic.
In fact, everything worked fine on the previous modem and on the 120Mb connection. and with torrents there were no problems.
I don't have access to this "modemorouter" and I can't set anything in it.
At the moment, the modem is connected via LAN to the computer and the link is correct, about 317Mb on the test.
Torrents work, transfers are even decent, and yet it screams that I have blocked ports.
Of course, WiFi is also needed, so from the second LAN port in the modem (there are four) a cable goes to the WAN in the router and a curiosity because, for example, the phone connects to the internet via WiFi, in the WiFi settings it shows me that everything is OK


but unfortunately nothing works and when I try to open any page it says I'm Offline.

beringen wrote:

I changed the soft in TP-link immediately after the purchase to gargoyle and increased the memory by plugging the pendrake into one USB. Soft is more efficient and has more possibilities because a media server and a regular camera as an IP worked on it, but that's off topic.

And this alternative software supports HWNAT at all?

beringen wrote:

Torrents work, transfers are even decent, and yet it screams that I have blocked ports.

If you don't have a public IP from your operator, that's how it will be.
I have already indicated what you should do in post #7.
How to check your current IP, e.g. here:
https://whatismyipaddress.com/pl/moj-ip
When you check, enter the first 2 octets.

176.221

Soft supports NAT, I remind you that on the previous modem from Multimedia everything worked, torrents worked without any errors, which means that the router worked as it should

@beringen
And you have the same IP address on this TPlink?

My IP is dynamically assigned, not static if that's what you mean.
That's what I have. settings if that helps


Added after 3 [minutes]:

I had to switch again to have access to the router, so now I have a LAN cable from the modem to the router on the WAN and everything works, but the link is limited to about 100Mb on the cable, not to mention WiFi

beringen wrote:

I had to switch again to have access to the router, so now I have a LAN cable from the modem to the router on the WAN and everything works, but the link is limited to about 100Mb on the cable, not to mention WiFi

You've already explained why above.

And as for the IP, you have a public IP on Technicolor and not on Asus - what to do with it so that torrents start working, you also have the above.

So if I understand correctly, I have to either move my router (TP-Link and not ASUS) as a bridge to work as an Access Point or buy a new router because mine will not support 300Mb / s cable?
There is little logic in this, considering that this TP-Link should handle an even faster link. I understand the speed limits on WiFi and I can even accept it, but that the cable gives such a limit, I don't get it.

beringen wrote:

but since the cable gives such a limitation, I don't get it.

I don't know on what basis you concluded that the transmission will be faster than one hundred and several dozen Mbps?
Also, you won a gargoyle that has no support for hardware NAT acceleration and does everything on the main processor, so another 40% less on performance.

And uploading the last original TP-Link firmware will change anything in terms of cable speed?[/s]

Added after 13 [minutes]:

I will ask about another solution.
As this Technicolor has 4 LAN outputs, you can theoretically connect 4 computers or other devices via a cable.
I tried to do this, i.e. one LAN went directly to the computer and in fact the transfers were ok, i.e. about 320Mb / sa from the second LAN, a cable went to the WAN of the router to catch WiFi on the rest of the equipment, but then even though the cells catch the signal and connect via WiFi, there is no connection with the net. Either I'm doing something wrong or this Technicolor doesn't divide the signal like that. Please correct me if I am mistaken.