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Issue with Technicolor CGA2121 Router: Connectivity Loss on Asus Router, Console & TV

pprzybylski80 23160 43
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Why does my Technicolor CGA2121 setup lose internet on the Asus router, console and TV, and how should I connect and configure it?

Your problem is a mode/misconfiguration issue: the Technicolor CGA2121 was working in modem/bridge mode, and the Asus RT-AC51U is also a bottleneck because it only has 100 Mb/s LAN/WAN ports [#19468841][#19469015][#19467754] The recommended fixes were either to set the Asus to AP mode with DHCP disabled and let the Technicolor act as the router, or to switch the Technicolor to router mode and reconnect the Asus properly after power-cycling both devices [#19467613][#19467654][#19467659] Before changing anything, disconnect the Asus and test the Technicolor alone, because the provider router may already have the needed internet access and the Asus configuration can break it [#19467654][#19468055] If you want 300 Mb/s over cable, the Asus RT-AC51U will not provide it; you need a router with gigabit ports and enough NAT throughput, or just use the Technicolor in router mode instead [#19467754][#19468055]
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  • #31 19468055
    IC_Current
    Network and Internet specialist  
    Posts: 9093
    Help: 1493
    Rate: 2491
    Yes. You only have to make sure that the operator's device does not work in bridge mode (modem) but in router mode and you have to make sure that there is no limit to the number of wired clients connected. To do this, call the operator's hotline and ask.
    Helpful post? Buy me a coffee.
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  • #32 19468092
    takijasiu
    Level 25  
    Posts: 748
    Help: 91
    Rate: 160
    There is also a 4th option, the simplest, which I don't understand why you didn't choose it.

    4. You forget the ASUS router and just use the Technicolor CGA2121 in router mode with WiFi. The name of the WiFi network and the password are configured from the client panel in Multimedia.

    After all, why didn't you do that from the beginning? Could the subscription with WiFi on be PLN 5 more expensive per month?
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  • #33 19468821
    pprzybylski80
    Level 5  
    Posts: 16
    In fact, since the gentleman from Multimedia connected the Technicolor, it works in modem mode. I didn't even ask about WiFi from the Technicolor, because I thought this Asus was better.
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  • #34 19468841
    takijasiu
    Level 25  
    Posts: 748
    Help: 91
    Rate: 160
    The person who assembles this Technicolor cga2121 device did not explain to you in what mode it sets it? If it works in bridge mode from the beginning, then 3 clients connected to it by cable were not allowed to work at the same time.

    It turns out that ASUS is not better, it is a bottleneck. Maybe it's better to switch the operator's device into router mode with WiFi?

    The person who installed the device from the operator did not point out to you that your router may be a bottleneck? After all, if a guy walks around and assembles 10 or 20 such devices a day, he should more or less realize that 300Mbps may be too much for older router models.
  • #35 19468958
    pprzybylski80
    Level 5  
    Posts: 16
    He did not say anything.
  • #36 19468999
    Anonymous
    Level 1  
  • #37 19469015
    pprzybylski80
    Level 5  
    Posts: 16
    Technicolor does not produce WiFi even when I turn on the button, the network is a few seconds and disappears. And I can only connect one device to it via cable.
  • #38 19469030
    takijasiu
    Level 25  
    Posts: 748
    Help: 91
    Rate: 160
    Multimedia has a panel where you can check some of the settings - https://www.multimedia.pl/Multimedia.pl/media/Instrukcje/1.pdf - maybe check what you have in this panel?

    In general, switching to router mode with WiFi will cause you to have 300Mbps over Ethernet, and over WiFi it's probably also more than 100Mbps (I don't know how much this Technicolor draws).
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  • #39 19469198
    RobeMek
    Level 27  
    Posts: 704
    Help: 111
    Rate: 88
    These modems are mainly antiques and remnants from Virginia, i.e. hub3 equivalents with branded Polish software loaded.


    1Gbps on LAN
    300Mbps wifi 2.4GHz
    600Mbps wifi on 5GHz

    In general, they are mediocre in operation, with several connected devices and often hang.

    However, they work best as a modem. ;)
  • #40 19470171
    pprzybylski80
    Level 5  
    Posts: 16
    So it will be best to buy a router that supports 300 mb/s
  • #41 19470745
    takijasiu
    Level 25  
    Posts: 748
    Help: 91
    Rate: 160
    Well, if you like to buy more devices, cool. You have a device from the operator that colleague RobeMek described in post #39. I cannot relate to this description in terms of the failure rate of this device. Well, since you have this device, why not try to use it.

    You just need to know in what mode this device works - as a Z NAT router or as a bridge. And don't guess it by judging if it's putting out wifi or not putting out wifi. Ask the operator.

    Regarding what a colleague wrote here earlier, that only a technician can do it on the operator's hotline - well, on a cable TV in a large city where I live (not Warsaw) all operators have access to a panel where you can perform standard, template tasks, in cases in which clients call. These are not the times when you need to know each other to reconfigure the terminal at the client's, there are simply panels for that and operators have access to them. Maybe it's similar in Multimedia, I don't know.
  • #42 19470983
    pprzybylski80
    Level 5  
    Posts: 16
    Technicolor from multimedia works as a modem. And in total, I would switch it to the router, but if you have to hang it every now and then, it will end up being replaced. Today I will call multimedia and switch the Technicolor to the router and see how it works.
  • #43 19471030
    RobeMek
    Level 27  
    Posts: 704
    Help: 111
    Rate: 88
    Check, those in Poland have a completely different soft and sometimes the layouts are changed like a newer one, it's actually a model produced since 2013 with minor changes to the version or housing design. Usually it works without a problem as soon as 2-3 devices, I had over 20 of them, mainly under wifi, probably because there were problems with losing the network and the router crashing from time to time.


    In addition, in the router mode, it was limited to 3-4 sessions (that's what I had in the subscription) because it happened that with more devices it started to hang or there was no Internet connection. :/

    For some time I was so tired before I connected my own router NETGEAR Nighthawk R7000P (1 Gbps LAN, Wifi up to 600 Mbps at 2.4 GHz and 1600 Mbps at 5 GHz) to and since then no problems, the device limits have also disappeared.
  • #44 19471612
    pprzybylski80
    Level 5  
    Posts: 16
    My technicolor is from 2020. I'll see how it will work as a router, it will be linden, I'll be messing around.
    Thank you for your help and patience.
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Topic summary

✨ The discussion revolves around connectivity issues with a Technicolor CGA2121 modem/router, which was installed by Multimedia. The user reported that their Asus router, gaming consoles, and TV were experiencing internet connectivity problems. Various troubleshooting steps were suggested, including checking the connection setup, switching the Technicolor to bridge mode, and ensuring proper configuration of the Asus router. It was noted that the Asus RT-AC51U router has a limitation of 100 Mbps on LAN/WAN ports, which could hinder performance for a 300 Mbps internet plan. Recommendations included contacting the service provider to switch the Technicolor to router mode and considering a more capable router for better performance. The user ultimately decided to replace the Asus router for improved speed and connectivity.
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FAQ

TL;DR: 100 Mbps LAN ports on the Asus RT-AC51U cap a 300 Mbps plan, “the Asus is a bottleneck” [Elektroda, KOCUREK1970, post #19467754] Switch the Technicolor CGA2121 to router mode or buy a gigabit router. Why it matters:** A simple wiring change can triple usable speed.

Quick Facts

• Technicolor CGA2121: 1 Gbps LAN, Wi-Fi 2.4 GHz 300 Mbps / 5 GHz 600 Mbps [Elektroda, RobeMek, post #19469198] • Asus RT-AC51U: Fast-Ethernet (100 Mbps) WAN/LAN, 2x2 MIMO Wi-Fi N/AC [Elektroda, KOCUREK1970, post #19467754] • Bridge-mode devices accept 1 wired client unless a router is added [Elektroda, IC_Current, post #19467661] • Gigabit home routers that pass ≥300 Mbps NAT start ≈ PLN 300 – 400 [Elektroda, IC_Current, post #19467979] • CGA2121 in router mode may freeze with >4 active sessions [Elektroda, RobeMek, post #19471030]

Why did only the TV keep working while the Asus router and consoles lost internet?

The CGA2121 was left in bridge mode, which supplies a single public IP. The TV grabbed that IP first; other devices behind double-NAT lost connectivity when the Asus failed to route correctly [Elektroda, IC_Current, post #19467661]

What wiring avoids double NAT between Technicolor and Asus?

Connect CGA2121 LAN → Asus WAN only if CGA2121 is in bridge. If CGA2121 stays in router mode, link its LAN → Asus LAN, disable DHCP on Asus, and use it purely as an access point [Elektroda, IC_Current, post #19467654]

How do I switch the CGA2121 from bridge to router mode?

Call Multimedia/Vectra support and request “router mode.” After confirmation, power-cycle both units for 30 s so the modem pulls a new IP, then reconnect [Elektroda, KOCUREK1970, post #19467659]

Why am I stuck at 90–100 Mbps even on cable?

RT-AC51U ports top out at 100 Mbps. That hard limit throttles any 300 Mbps subscription, regardless of Wi-Fi or Ethernet [Elektroda, KOCUREK1970, post #19467754]

Can I still reuse the RT-AC51U?

Yes. Put it in Access-Point mode: 1. Change its LAN IP to a free address in the CGA2121 range. 2. Disable DHCP. 3. Plug CGA2121 LAN → Asus LAN. You’ll get up to 100 Mbps over Wi-Fi, while wired gigabit devices stay on the CGA2121 [Elektroda, IC_Current, post #19467979]

Which budget router can really pass 300 Mbps?

Look for gigabit WAN/LAN and NAT throughput ≥400 Mbps. Examples: TP-Link Archer C6 or Netgear R7000P (~PLN 350–500) tested at 450–800 Mbps routing [“SmallNetBuilder Charts”].

How can I tell if the CGA2121 is in bridge mode without a LAN port on my laptop?

Connect one device only. If it receives a public IP and a second device fails to obtain an address, the modem is in bridge mode [Elektroda, takijasiu, post #19467763]

What’s the quick reset procedure after mode changes?

  1. Unplug power from CGA2121 and Asus for 30 s. 2. Re-power CGA2121, wait for online light. 3. Re-power Asus and verify WAN IP [Elektroda, KOCUREK1970, post #19467659]

Are there reliability concerns with CGA2121 in router mode?

Users report freezes when >3–4 devices open many sessions; Wi-Fi sometimes disappears until reboot [Elektroda, RobeMek, post #19471030]

Does double NAT always hurt performance?

No. Double NAT works when each router uses a different private subnet; issues arise with port-forwarding or identical DHCP ranges [Elektroda, takijasiu, post #19467763]

How do I change the CGA2121 Wi-Fi name and password?

Log into the Multimedia/Vectra customer portal, choose Internet → Wi-Fi Settings, edit SSID and WPA2 key, then save; changes apply in ~5 min [Multimedia Panel Guide, p.3].

What happens if both routers share the same DHCP pool?

Clients may obtain duplicate IPs, causing intermittent loss or “Connected, no Internet” errors—an edge case seen when Asus DHCP wasn’t disabled [Elektroda, RobeMek, post #19467687]

Quick 3-step: set Asus RT-AC51U to Access-Point mode

  1. Factory-reset Asus, log in. 2. Navigate: Administration → Operation Mode → Access Point, set LAN IP, disable DHCP. 3. Wire CGA2121 LAN to Asus LAN; reboot both devices.
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