How to change the bridge to the mobile optical modem? Copy the VLAN first, then act. After the changes, don't panic if you go blind with your family members

my childhood friend has a 500Mbps mobile broadband, and the optical modem is a Huawei custom left by a 2023 installer, with two Mercury M6G mesh sets hanging underneath. Last month, his son played online with classmates on a Switch and found the NAT type was strictly D. After checking along the way, the root cause was just one thing: optical modem router dialing, M6G with an extra layer of internal network underneath, two layers of NAT stacked, and the console locked in the innermost room.

he had just recently gotten his hands on the CMCCAdmin super password (I remember the process in the of the mobile optical modem super password post ), the first thing he did after entering wasn't changing the bridge, but being confused by the row of WAN connections in the backend. This article will go through the mobile version's bridging from start to finish, which differs quite a bit from the telecom script.

Mobile's Bridge is not about public networks IP

first set expectations correctly. Among online articles teaching you how to change bridges, eight out of ten use public IPs as selling points—that's the script of China Telecom—calling 10,000 numbers can still get a public IPv4 (how to check if you have it? check the three-step judgment in this article ). Mobile is basically out of the question—the whole is a CGNAT compound. So mobile users switching to bridge are aiming for three practical things.

First, compress double-layer NAT into a single layer. In optical modem router mode, the M6G uses the 192.168.1.x file from the optical modem, and you send another layer under it. For point-to-point tasks like online connections and video calls, you have to pass through an extra wall. The second is IPv6. Mobile Home Broadband's IPv6 coverage is even wider than Telecom's. After bridging, the prefix is directly distributed to M6G, so phones and NAS can get proper V6 addresses (the location of the Mercury router's V6 switch in this article). Third, tasks like port forwarding and DMZ are all handled on your own router, so you don't have to dig up the two layers of backend on the modem. By the way, a quick tip: the backend of the China Mobile Optical Modem is 192.168.1.1, which is not the same door as the router's backend. Before switching to bridge, first glance at the browser's address bar, run the wrong door, and spend ages modifying the router—I've seen it before.

is it worth the hassle of this ledger? I calculated in the on bridge modifications, and there is also a here on the telecom version of the decision chain. Now, let's talk about how to get started with the mobile version.

Before

get started, take two photos

CMCCAdmin, don't click Save at all. Go to 'Network' → 'Broadband Settings' (some firmware uses WAN connection). The dropdown menu will list all connections on the optical modem. The one from my childhood friend looks like this: 1_INTERNET_R_VID_45. This string of names carries a lot of information: INTERNET indicates the main internet connection, R stands for routing mode, and the VID_45 at the end is the VLAN number.

took two photos with her phone. The first photo shows the full parameters of this connection: VLAN mode, VLAN ID, and bound port. The second photo is for broadband accounts—the China Mobile account is clearly written inside. The childhood friend is a phone number plus @139.gd suffix, which is most likely to be missed when dialing yourself. The password field is marked with an asterisk and no one can see it. If you forget, just dial 10086 or reset it on the broadband page of the China Mobile app. It's more reliable than guessing blindly (I've written a few ways to recover broadband accounts in article, for carriers).

VLAN this string of numbers shows the biggest difference between mobile bridging and telecom. Some provinces don't have VLAN, while others do. I've seen Renbao in the 1936, 45, 101, and 2001 versions. When changing the bridge, this number must remain on the optical modem side as is—the home router's WAN port basically has no place to fill in VLAN, so tagging is done by the optical modem. If you copy the wrong person, no matter how you try to try the router, it will freeze.

How to click

backend? Take a Huawei custom phone as an example

two other links in the connection list, one named TR069, which is the lifeblood of mobile remote management; One with IPTV or OTHER, managing TV. Don't touch either of these two; if you move the TV, the screen goes black (the real black rescue method in this article). Only the INTERNET section, five steps to complete:

interface is different, don't worry. That Huawei friend used to edit the mode directly; Some models only have a "New" button, so just follow the photo to create a new bridge connection, copy all parameters, and then disable or delete the original route. The menus for ZTE and TEWA mobile custom phones vary, so just focus on two keywords: in Broadband Settings (or Network Settings), find the connection name with INTERNET, and in Mode, find Bridge. Unicom users use CUAdmin, and the method is exactly the same. The entry point the from Unicom UltraSecret.

router dial-up can't connect, check these three points first

the modem was modified and only gave up the door; the actual dialing was the M6G. Go to the Mercury backend, choose broadband dial-up PPPoE for internet access, connect your account @Fill in all the suffixes together, use the password you just reset, and don't change the MTU (PPPoE defaults to 1492). My childhood friend got stuck on dialing failure on the first trip, and after coming back, he checked it again—the three most common spots.

First, the cable is inserted into the wrong port. The bridge is bound to LAN1, so the router's WAN cable must be plugged into the optical modem (LAN 1). Plugging it into another port means connecting the cable into a room without a bridge, and no matter how you try to dial it, the server will not respond. Second, the VLAN was copied incorrectly or not copied, which is a unique pitfall for the mobile version. Go back to the broadband settings and double-check the numbers. Third, account suffixes and characters. @139.gd this kind of tail misses even a single letter and authentication fails, and the passwords for l and 1, or O and 0, are old problems. Even if all three locations are correct, you still can't dial it. In some provinces, mobile is restricted from bridging at the bureau end, so you need to get a maintenance technician to let you through, which you can't handle yourself.

can't get through or find any issues, here's a simple remedy: plug your laptop directly into the optical modem LAN 1, create a new broadband connection in the system, and enter your account password as is. If the computer can dial through, it means both the optical modem's side bridge and VLAN are fine, and the problem lies in the router's settings. If the computer can't get through either, then it's VLAN, account, or the bureau issue, and has nothing to do with M6G. That night, it was this step that cleared all suspicion from Mercury, and in the end, the real culprit was the account ending with a missing letter.

after dialing, first check the count. My childhood friend had 500MB, and M6G direct connection measured 487, basically the same as during the optical modem router mode—bridging speed boost is a false proposition; the real improvement is Switch multiplayer, NAT going from D to B, so this effort wasn't wasted.

After

changes: Hejiaqin becomes half blind, RMS might come in the middle of the night

costs are concentrated in two places. The first was and Jiaqin (now renamed Mobile Aijia). It manages the optical modem. After bridging, all family devices are attached to the M6G, and the online device list in the app is basically empty, leaving only the optical modem alone; Check the modem status and remote restart—they're still alive. Don't expect kicking or speed limiting—if you want to control the device, you have to go back to M6G's own app. If you're installing a mom or dad's home, you need to plan this layer in advance. If the elderly rely on checking equipment with their family, don't change the bridge for now.

second is RMS. Mobile remote platforms push configurations back to routing mode, especially during those few hours in the early morning. The countermeasure is the same as the one in the Ultra-Secret article: go to 'Network' → 'Remote Management', turn off RMS periodic reporting (the set of F12 processing in the browser is marked at the end of the Ultra-Secret section). The telecom side has a similar problematic issue called ITMS. this article thoroughly explores the backlash principle, and the principle is universal. After my friend turned it off, it hasn't been pushed back for over a month. His IPTV has been working fine because the WAN controlling the TV hasn't been touched at all.

who should change, and who should not be tormented

the sequence of endings: take a WAN connection table→ read the VLAN and account → reset the broadband password→ change the bridge to bind to LAN1→ M6G dial-up→ turn off RMS cycle reporting. If it runs smoothly, it takes half an hour, and most of the stuck issues are stuck at the VLAN and account extensions. After making corrections, print a photo and put it in the weak current box. One day, when a technician comes to replace the optical mode, the new machine copies it once and comes back.