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

beringen 13284 19
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Why does my TP-Link WDR3600 only give about 120 Mbit/s after upgrading to a 300 Mbit/s Technicolor modem/router, and why do torrents say the ports are blocked?

Your WDR3600 is the bottleneck: in router mode it cannot route 300 Mbit/s, and with Gargoyle it loses hardware NAT acceleration, so speeds around 100–120 Mbit/s are expected [#19467647][#19469610] Technicolor is not a pure modem just because its Wi‑Fi is disabled; it still does NAT and firewalling unless you manually switch it to bridge mode in the client portal [#19467647] If you want to keep the TP-Link, put it into access-point mode instead: connect LAN-to-LAN, disable DHCP, and change its LAN IP [#19467676] For torrents, you also need the Technicolor in bridge mode and a public IP from the operator; without a public IP, port forwarding will not work and the client will report blocked ports [#19467704] Before changing anything, test with only one PC connected by cable and Wi‑Fi off to get a certified speed measurement [#19467228]
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  • #1 19467163
    beringen
    Level 9  
    Posts: 90
    Rate: 3
    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
    Technicolor CGA2121 w Multimedia Upgrade to 300Mbit - TP-Link WDR3600 Router Connection Issues
    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?
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  • #2 19467189
    Anonymous
    Level 1  
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  • #3 19467220
    beringen
    Level 9  
    Posts: 90
    Rate: 3
    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.
  • #5 19467647
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35131
    Help: 3786
    Rate: 5326
    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/
  • #6 19467676
    IC_Current
    Network and Internet specialist  
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    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.
    Helpful post? Buy me a coffee.
  • #7 19467704
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35131
    Help: 3786
    Rate: 5326
    @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.
  • #8 19467708
    IC_Current
    Network and Internet specialist  
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    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.
    Helpful post? Buy me a coffee.
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  • #9 19467717
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35131
    Help: 3786
    Rate: 5326
    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.
  • #10 19467720
    IC_Current
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    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.
    Helpful post? Buy me a coffee.
  • #11 19467738
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35131
    Help: 3786
    Rate: 5326
    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.
  • #12 19468467
    beringen
    Level 9  
    Posts: 90
    Rate: 3
    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
    Technicolor CGA2121 w Multimedia Upgrade to 300Mbit - TP-Link WDR3600 Router Connection Issues

    but unfortunately nothing works and when I try to open any page it says I'm Offline.
  • #13 19468560
    KOCUREK1970
    Network and Internet specialist  
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    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.
  • #14 19468611
    beringen
    Level 9  
    Posts: 90
    Rate: 3
    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
  • #15 19468613
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35131
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    @beringen
    And you have the same IP address on this TPlink?
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  • #16 19468648
    beringen
    Level 9  
    Posts: 90
    Rate: 3
    My IP is dynamically assigned, not static if that's what you mean.
    That's what I have. settings if that helps
    Technicolor CGA2121 w Multimedia Upgrade to 300Mbit - TP-Link WDR3600 Router Connection Issues

    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
  • #17 19468689
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35131
    Help: 3786
    Rate: 5326
    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.
  • #18 19469192
    beringen
    Level 9  
    Posts: 90
    Rate: 3
    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.
  • #19 19469610
    IC_Current
    Network and Internet specialist  
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    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.
    Helpful post? Buy me a coffee.
  • #20 19469974
    beringen
    Level 9  
    Posts: 90
    Rate: 3
    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.
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Topic summary

✨ The discussion revolves around issues faced by a user after upgrading their internet speed from 120Mbit to 300Mbit with a new Technicolor CGA2121 modem. The user experiences limited bandwidth when connecting through their TP-Link WDR3600 router, despite achieving the expected speed when connecting directly to the modem. Responses suggest that the TP-Link router may not support the higher speeds due to its hardware limitations and NAT configuration. Recommendations include switching the Technicolor modem to bridge mode, using the TP-Link in access point mode, and ensuring a public IP address is assigned to resolve torrent connectivity issues. The conversation highlights the importance of proper configuration and hardware capabilities in achieving desired internet speeds.
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FAQ

TL;DR: 120 Mbps is what a TP‑Link WDR3600 typically pushes, and “These 120Mbps is just what it can handle.” CGA2121 routes by default, causing double NAT that breaks torrents; fix via AP mode or bridge + public IP, then run a certified test. [Elektroda, IC_Current, post #19467676]

Why it matters: This FAQ helps CGA2121 + WDR3600 owners unlock 300 Mb/s, avoid double NAT, and restore torrents.

Quick Facts

Why am I stuck around 100–130 Mb/s on a TP‑Link WDR3600?

Its WAN/NAT path is CPU‑bound. That model cannot route much beyond ~120 Mb/s. As one expert put it: “These 120Mbps is just what it can handle.” Use it as an Access Point to bypass its NAT. Or upgrade hardware if you need routing at 300 Mb/s. [Elektroda, IC_Current, post #19467676]

How do I configure the WDR3600 as an Access Point to bypass the bottleneck?

Set it to Access Point mode to bypass routing.
  1. Connect CGA2121 LAN to a WDR3600 LAN port (not WAN).
  2. Change WDR3600 LAN IP to an unused address; disable its DHCP.
  3. Reboot; use WDR3600 only for Wi‑Fi and switching. [Elektroda, IC_Current, post #19467676]

Does disabling Wi‑Fi on Technicolor CGA2121 make it a pure modem?

No. “It’s still a modem router with NAT, firewall, etc.” To make it a bridge, switch it to bridge mode in the client portal. Otherwise it continues routing. [Elektroda, KOCUREK1970, post #19467647]

When should I use bridge mode on the CGA2121?

Use bridge mode when your own router must handle NAT and port forwarding. For torrents, enable bridge mode, connect CGA2121 to your router’s WAN, set router WAN to DHCP, and get a public IP. “Without the latter, whatever you do, the torrent will not connect.” [Elektroda, KOCUREK1970, post #19467704]

Why does uTorrent say ports are blocked even though downloads run?

You are behind double NAT or CGNAT, so inbound peers cannot reach you. The operator device routes by default and often gives your router a private WAN address. Fix it by using AP mode or buying a public IP. “Torrent then won’t work.” [Elektroda, IC_Current, post #19467676]

How can I check if I have a public IP?

Open whatismyipaddress.com and note your external IP. Share the first two octets for diagnosis, as suggested. This helps confirm if the address is public or private. [Elektroda, KOCUREK1970, post #19468560]

What Wi‑Fi speeds can I realistically expect on 802.11n 2x2 gear?

With 40 MHz channels and clean conditions, expect about 230 Mb/s throughput. With 20 MHz channels, about 120 Mb/s. Each client uses only one band. Use inSSIDer or WiFi Analyzer, and rotate devices during measurements for accuracy. [Elektroda, Anonymous, post #19467189]

What’s the correct way to test my 300 Mb/s line?

Run a certified test at pro.speedtest.pl. Connect only one PC via Ethernet to the router. Turn off Wi‑Fi during the test. This isolates the link and avoids device contention. [Elektroda, Anonymous, post #19467228]

Will reverting from Gargoyle to stock firmware improve wired throughput?

Gargoyle lacks hardware NAT acceleration and shifts routing to the CPU. Expect roughly 40% lower throughput than with accelerated firmware. Use firmware that enables hardware NAT to improve WAN speed on this hardware. [Elektroda, IC_Current, post #19469610]

What WDR3600 hardware limits affect speed?

It uses an Atheros AR9344 at 560 MHz with 128 MB RAM. Such specs cap routed throughput well below Gigabit. An older 1043ND had 1 Gb ports yet “choked at 120 Mb,” showing port speed isn’t NAT speed. [Elektroda, KOCUREK1970, post #19467647]

My phone shows “Connected, no internet” via the WDR3600. How do I fix it?

Your router likely has no usable WAN lease or is double‑NATed. Convert the WDR3600 to AP mode: plug CGA2121 into a WDR3600 LAN port, disable DHCP, and set a LAN IP. This restores internet to Wi‑Fi clients. [Elektroda, IC_Current, post #19467676]

Can I connect a PC directly to the CGA2121 and still use the WDR3600 for Wi‑Fi?

Yes. Connect the PC to one CGA2121 LAN port. Put WDR3600 in AP mode and connect another CGA2121 LAN port to a WDR3600 LAN port. The CGA2121 routes; the TP‑Link provides Wi‑Fi. [Elektroda, IC_Current, post #19467676]

Do I need a new router to fully use 300 Mb/s?

No. You can avoid the WDR3600’s WAN bottleneck by using Access Point mode. As noted, you “don’t have to buy anything.” Upgrade only if you need advanced routing or higher future speeds. [Elektroda, IC_Current, post #19467720]
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