On the optical modem, only network port 1 can access the Internet and other ports cannot access the Internet? It's not that the mouth is broken, it's that the VLAN has tied the mouth shut, and the three paths are untied.

Last week, I helped my cousin clean up his newly rented house. The only network left by the landlord was a single wire coming out of the weak current box. He plugged the network cable of the computer in the study into the optical modem - network port 1, the light was on, and the network was available. The next day, I changed the position and plugged it into the network port 3. The light was also on, but I couldn't connect to the Internet. The lower right corner of the computer rotated for a long time. His first reaction was that his mouth burned, and his second reaction was that the optical modem was broken and he needed to report it for repair. I went over to take a look and it was neither. I went through this on my own TEWA-750G three years ago, and it was fine immediately after changing the cable back to network port 1. At that time, I went through half of the backstage to understand the doorway here.: The ports of optical modem are not four equal paths. When the operator configured the network, he only built the "Internet" path to network port 1, and the other ports did their own work. This article explains the principle and three solutions at once.

Think about it first: The mouth is good, but the road is closed

Many people assume that an optical modem is like a switch. You can plug it into any of the four ports and everything will work. No. The traffic that comes from the optical fiber of the optical modem must be cut according to "business" inside the machine.: There is one way to go online, another way to live TV, and another way for Guanguangmao's own remote configuration. These lanes are called WAN connections in the background, and each one has a VLAN tag on it. The labels vary from place to place. The Internet access on my telecom is VLAN 46, and the TV is VLAN 45. My friend from China Unicom in Hunan copied it out as 41 - the specific number is meaningless, which means "one lane, one number."

Each path cut out must exit from a physical opening behind the bare cat's butt. Who decides which entrance to take? It's hard-coded in the factory configuration. This is called port binding. The default binding for most provinces is: The WAN for accessing the Internet is bound to network port 1 (some add network port 4), and the TV is bound to network port 3 or the port specifically marked IPTV. When you plug your computer into network port 2, the cable is connected, the light is on, and the computer is sending data packets honestly. However, when your packet comes in from network port 2, you cannot find the outlet with the Internet label - the label's path has not been repaired to this port at all. This is the whole truth of "the lights are on but there is no internet", and it has nothing to do with whether the mouth burns or not. I want to take a more systematic look at what each of these WANs manages. WAN connection article There is a comparison table.

By the way, let me tell you about the symptoms of a brother who is easily confused: I plugged it into the right port, but the speed test is stuck at around 93 Mbit/s. That is a problem with the Gigabit port and the 100 Mbit/s port. The speed is ten times worse but there is an Internet connection anyway. This is two different diseases from the "no Internet connection at all" mentioned today, and the troubleshooting route is also different. Recognize the article That's what it's about.

Diagnosed in one minute: Don't disassemble the phone, just do three actions

To confirm whether you have hit this pit, do three things in order without using any tools.:

• Replace the cable back to network port 1 (or the port marked GE/Gigabit on the sticker) and see if the computer can be connected after the light turns on. Being able to do it is basically a matter of oral binding.
• Pay attention to the small print next to the mouth. Some machines have IPTV or ITV printed on the bottom of network port 3, and something else printed on network port 2. The silk screen is the instructions left by the operator when distributing the brand.
• If you're still not at ease, go backstage and take a look. In routing mode, connect the mobile phone to optical modem WiFi and open the browser. 192.168.2.1 , log in as useradmin, look for the WAN connection or LAN port configuration page in "Network", you can see which ports are behind each connection.

My judgment habit is: If you change the interface and set it up, 99% of it is bound. ； If there is still no network connection after changing the port, first suspect the network cable and mode. The eight-core network cable is broken and four cores are broken. This is an old case. If the optical modem is changed to a bridge, all LAN ports should not have network. That scenario needs to be solved. Determine bridge or routing mode Get it now, don’t waste your time on this article.

There is also a special case reminder: My friend's ZTE F7015T has the opposite problem. No matter which port it is plugged into, it will work. If two ports are plugged in at the same time, packets will drop like crazy. That is the problem of port aggregation, which is different from binding. The article about ZTE dual port package swap There is a complete investigation.

I want to have more ports to access the Internet: Three roads, the costs are very different

What to do after diagnosis depends on your real needs. I tried all three methods at my cousin's house and my own house. Let's make an account first.:

The first path is the least suspenseful. Buy a five-port or eight-port unmanaged switch. Connect a cable from the optical modem port 1 to the switch. The study room, living room, and TV cabinet are all connected from the switch. This is equivalent to widening the network port 1 and tying up other ports without touching it. Don’t make the mistake of buying something that costs fifty-six yuan and buy a management type. It makes no sense to spend extra money for household use. How do you choose and receive it? The switch article I have written that it will not go wrong if you plug all the cables into the LAN port for the first time.

The second rule is to save money but waste time. Use the super password to enter the backend - how to get the telecomadmin of China Telecom? Get the super secret article There are channels - find the "LAN Port Binding" or "Port Binding" page, check the WAN connection next to the Internet, check network port 2, save and restart. After completing the network port 2, it will also be the Internet port. China Unicom's machine cannot access the web backend. The two commands sendcmd 1 DB p WAN and sendcmd 1 DB p VLAN in telnet can copy out the binding. The idea is: Check the VLAN article It's there, but it's harder to change it back than to copy it out. Don't try it if you're not familiar with the command line.

The third item is to call 10000 or the maintenance phone number and make it clear that "multiple rooms need to be connected to network cables to access the Internet. Please add an extra port for the binding." The master's remote ITMS will be done with just one push. Some provinces are free and some charge a door-to-door fee of 10 or 20 yuan. Please ask before making an appointment. This one looks the most tacky, but it’s actually the most stable. If something goes wrong, someone will tell you the truth.

Before changing the binding, three pitfalls should be laid out first

The first pitfall is not to touch the TV. You see more than one WAN connection on the binding page, one for Internet access, one for IPTV, and one for management OTHER/TR069. Don’t unbind the management system. If you untie the ITMS, you can’t contact Shangguangmao. The remote hand I can't touch your home anymore, and I can't make any subsequent package adjustments or remote repairs. Don't just move the TV. The set-top box will recognize you and the TV screen will go black if you move it. The gain outweighs the loss. How to mess around with the TV is another strategy. IPTV single line multiplexing article Be specific.

The second pitfall was that it was changed back in the middle of the night. Binding is a configuration at the service activation level. Unlike WiFi, whose name is "user private space", ITMS may erase the ticks you added during routine synchronization, especially mobile RMS. I added the binding to network port 2 on my own station, and it was not active for more than a month. However, someone in the same community made the changes on the mobile station and returned after three days. The rules of the computer rooms in various provinces are not uniform, and there is no accuracy. If it is really changed, change it again, or accept this reality and go directly to the switch. The same thing happened when the bridge was changed but was changed back. That article The coping ideas can be directly transferred over.

The third pitfall is don’t rush to call it a day after making changes. After saving and restarting, take the computer and test the speed on the new port to see if it is halved compared to network port 1. I have seen cases where the negotiation speed drops to 100 Mbit/s after changing the binding. That is because the port itself is a 100 Mbit/s port. No matter how correct the binding is, it only has a life of 100 Mbit/s, which is a waste of time. The speed of looking at the mouth can be used Recognize the method of gigabit port , three moves without disassembling the machine.

To be fair: Most people don't even need to understand

At this point in the article, I need to get back to what I said. Binding does not pose a problem to most families at all - the only thing that really needs a wired outlet is one cable from the router, and the network port 1 is a matter of course, leaving other ports empty. People who will run into this trap are basically those who rent a house and take over the landlord's old network, rewire the old house, or want to plug a cable into the TV cabinet. For most of these needs, just adding a switch is enough. It is really worth going to the backend to change the binding step. I can't pick one out of ten.

In the end, my cousin bought a TP five-port switch for fifty-nine yuan. One cable was connected to network port 1 and connected to the study and living room. The IPTV set-top box on network port 3 remained unchanged, and everyone was happy. He originally wanted to repair the optical modem and replace it with a new one, so that he could save the time of making phone calls and install the switch. If one day you change the mode and register it yourself, remember that the binding of the new machine is not necessarily the same as the old machine. When copying the parameters, in addition to the LOID and VLAN, also take a look at the binding relationship. The article about changing cat parameters Check the list again.

Put the finishing touches in order: First change the network port 1 to confirm that it is bound and not hardware. If the port is not enough, buy a switch. If you want to save money, go to the backend and change the check boxes, but do not touch the TV and management items. After changing the speed test and acceptance, if it is changed back, change it again or simply use the switch. After walking in four steps, you will have completely touched the openings behind the cat's butt.