Accessing & Configuring Arris Vectra Modem 2022: Bridge Mode, Docsis 3.1, and WiFi 6 Tips

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#31 20211029 27 Sep 2022 22:14

oculars_increasers oculars_increasers

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Post #31
20211029 27 Sep 2022 22:14

With my Arris, when I switch to open mode, I have to reset the modem several times and only after some (often the third / fourth time) it fires with the network name ARRIS-XXXX. Then the login details on the modem work. In general, the topic of open mode is interesting, because Vectra has been defending itself for a long time against giving access to modems to its clients. Unfortunately, in my case, the modem restarts itself every now and then, thus forgetting, for example, fixed IP addresses. You can see that they are still struggling with the topic and their approach is changing. In my opinion, it is worth playing with it from time to time to check how it works at the moment, but, for example, I like to return to the bridge mode and my own router, which gives me the certainty that suddenly the WiFi network will not disappear, because the modem must release reboot yourself.
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#32 20254766 26 Oct 2022 23:35

Keers_ Keers_

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Post #32
20254766 26 Oct 2022 23:35

@bill And how did you log in? Because today I turned on the OPEN mode and I can't log in with any login and password, but I haven't reset the modem yet and I don't know if it's worth it.
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#33 20268248 04 Nov 2022 20:55

madab81 madab81

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Post #33
20268248 04 Nov 2022 20:55

For me, the open mode causes both the Technicolor modem and the TV to lose signal every few minutes for about 10 seconds. Not only that, when I changed to router mode, I still had problems. Only the reset helped, because it probably remembered some data from the open mode. It is strange that the modem is on a cable other than the TV due to the fact that I have a CI card. Finally, I set the bridge mode and use my own router.
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#34 20318998 05 Dec 2022 00:57

husia husia

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Post #34
20318998 05 Dec 2022 00:57

Hi. Gentlemen, help me. I have a Technicolor CGA4236 modem and I can't access it for anything. I already have the Open mode in the settings, but no admin/admin logins and passwords or those from the sticker work. I'm not very proficient in this, so I'm asking for a pathological instruction if and what I should do to get in. Thank you in advance!
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#35 20319068 05 Dec 2022 06:35

Ptrzask Ptrzask

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Post #35
20319068 05 Dec 2022 06:35

You need to do a long modem reset. That is, press the "reset" button for at least 30 seconds, then wait until all the lights turn green. To be sure, turn the modem off and on again.

This way works for me every time. Modem access data as on the sticker underneath.
#36 20410214 28 Jan 2023 21:43

Marcin Socha Marcin Socha

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Post #36
20410214 28 Jan 2023 21:43

Welcome
I have a TECHNICOLOR CGA4236 with full access - a small local operator.
Any chance to use USB?
For a while I had two separate networks on 2.4 and 5.
Now I don't see this option. Reset needed?
#37 20438646 14 Feb 2023 10:19

piotrsosnowski2 piotrsosnowski2

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Post #37
20438646 14 Feb 2023 10:19

Can anyone check if there is an 802.3AD option to enable in this modem? I am trying to run link aggregation on the Asus AX-86U router and unfortunately it does not work on the default modem settings from Vectra. I don't want to mess with the modem unnecessarily (OPEN mode is) if there is no such option to enable.

Thank you
Peter
#38 20480415 11 Mar 2023 08:11

joujek joujek

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Post #38
20480415 11 Mar 2023 08:11

Hi,
I also have a GCA4236 and I couldn't find any information about 802.3ad aggregation support.

Finally, I set GCA to bridge mode, and on my asus rt-ax82u router I launched dual wan. In the dual wan configuration, I set the load balancer to 1:1. In addition, I set the rules so that half of the network uses one wan and the other half uses the other wan. In bridge mode, I have two different public ip addresses and without rules, there were problems with sessions on pages (every operation is different / second ip), so the rule will divide the pool into devices connected with a cable and WiFi devices separately

Internet speed tests from the router show full use of 1.2Gb.
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Topic summary

The discussion revolves around accessing and configuring the Arris Vectra modem, specifically focusing on the challenges and solutions related to enabling bridge mode, utilizing Docsis 3.1, and managing WiFi 6 settings. Users share experiences with Vectra's recent introduction of an "open" mode for selected modems, allowing for greater configuration options. However, many report issues such as unstable connections, inability to separate WiFi bands, and loss of custom settings after reboots. Users suggest methods for accessing the modem's settings, including performing factory resets and using specific login credentials. The conversation highlights the balance between using the operator's modem and personal routers for optimal performance.
Summary generated by the language model.

FAQ

TL;DR: Up to 1.2 Gbps download is possible on Vectra’s Arris/Technicolor modems; “leave it in Bridge” [Elektroda, Interesant, post #19843057] if stability matters [Elektroda, oculars_increasers, post #19842425] Open mode unlocks admin rights but resets erase some settings.

Why it matters: Picking the right mode decides whether you enjoy full speed or fight firmware quirks.

Quick Facts

• Max package speed: 1200 Mbps ↓ / 100 Mbps ↑ [Elektroda, oculars_increasers, post #19842425]
• Supported for Open mode: Arris CGA4236, Technicolor CGA4236; partial on CGA2121 [Elektroda, WWML, #19847796; oculars_increasers, #20003170]
• Long reset: hold RESET ≥30 s until LEDs off to restore sticker credentials [Elektroda, Ptrzask, post #20319068]
• Editable in Open: DNS, port-forwarding, LAN IP, firewall [Elektroda, oculars_increasers, #19847858; Ptrzask, #20049176]
• Modem swap fee: approx. PLN 500 [Elektroda, oculars_increasers, post #20003142]

What is Vectra’s Open mode?

Open mode loads alternative firmware that gives customers direct access to the modem’s full web GUI, including advanced Wi-Fi, firewall and LAN settings [Elektroda, WWML, post #19847796]

How do I enable and log into Open mode safely?

In eBOK set Device Mode → Open (Advanced).
Wait for reboot, then hold RESET ≥30 s until all LEDs go dark.
After restart, connect by cable or WPS and browse 192.168.100.1 using sticker credentials [Elektroda, WWML, post #19880706]

Which modem models work with Open mode?

Arris CGA4236 and Technicolor CGA4236 support Open fully; Technicolor CGA2121 shows partial access; EPC3928 and older lack the option [Elektroda, oculars_increasers, #19847858; zoom1500, #20002379].

What settings can I change once inside?

Users report editing custom DNS, port-forwarding rules, DHCP ranges, firewall levels and channel bandwidth (20/40/160 MHz) [Elektroda, WWML, #19864776; Ptrzask, #20049176].

Why do some passwords fail after switching modes?

Provisioning can overwrite credentials. A long reset restores factory username/password shown on the bottom label [Elektroda, Ptrzask, post #20319068]

Is Bridge mode still recommended for stability?

Yes. Bridge eliminates firmware bugs and lets a personal router handle Wi-Fi. "Operator equipment may be unstable" in router mode [Elektroda, Interesant, post #19843057]

Does Open mode allow 802.3ad link aggregation?

No menu for 802.3ad appears on CGA4236, so link aggregation fails [Elektroda, joujek, post #20480415]

How can I reach the full 1.2 Gbps with my own hardware?

Put the modem in Bridge, then use a multi-gig router or dual-WAN load balancing; users measured 1.2 Gbps traffic this way [Elektroda, joujek, post #20480415]

What are the known Open-mode bugs?

SSID separation disabled on 2.4 / 5 GHz [Elektroda, Ptrzask, post #19864729]
VoIP lamp blinks; phone unsynced [Elektroda, Ptrzask, post #19864729]
Periodic reboots wipe fixed IPs or forwards [Elektroda, oculars_increasers, post #19970160]
Edge case: TV and modem lose signal every few minutes [Elektroda, madab81, post #20268248]

Can I split 2.4 GHz and 5 GHz networks?

Currently not in Open firmware; the SSID field is locked to single-name operation [Elektroda, WWML, post #19864776]

Will my landline phone work in Open mode?

No. Users report constant red blink and no SIP registration after switching [Elektroda, Ptrzask, post #19864729]

How many devices work in Bridge mode without a router?

Bridge exposes only one public IP over cable and one over Wi-Fi—two devices total [Elektroda, LordWisienka, post #19922949]

Is Open mode officially supported now?

Vectra lists “Open – for advanced” in eBOK, yet support warns it’s for technician diagnostics and may void assistance [Elektroda, oculars_increasers, #19970160; Ptrzask, #20028577].

What does replacing the modem cost?

Vectra charges up to PLN 500 for a model swap [Elektroda, oculars_increasers, post #20003142]

How do I revert to Vectra-managed Router mode?

Select Router in eBOK, wait for reboot, then hold RESET 10 s. Firmware re-provisions automatically, restoring Vectra’s default Wi-Fi and admin lockout [Elektroda, LordWisienka, post #19915824]