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The sticker at the bottom of the telecom optical modem is its account book: model, SN, default terminal configuration password, LOID, management address—every line has a chance to save its life. Fault reporting requires SN, account closure and verification requires SN, and accessing the backend requires that fine-print password. I'll explain each of the three optical modems I have on hand, and how to fix stickers that are smudged....

What exactly is WebDAV in a NAS, and how do you enable it? I use it to connect the iPhone's built-in file app directly to my home NAS, instantly turning a 256GB phone into 4TB, and Joplin phone notes all rely on it for free multi-device syncing. Synology's entry point, Feiniu FN ID public network connection method, iOS self-visa documents failing to connect—all these pitfalls are clearly covered in this article....

IP addresses appear daily, but addresses starting with 192.168 mean they can't connect to home devices outside, which most people can't identify. I started by talking about a remote NAS connection to my cousin and causing trouble, and sorted out all the strange addresses of public and private, NAT translation, 127, 169.254, and 100.64....

The Xiaomi Router 4A is a single device with two devices: the 100Mbps MT7628 single-core with 64MB of memory and a 100Mbps port, while the gigabit version MT7621A dual-core with 128MB and a full gigabit port. Sanshu's 300Mbps broadband is firmly suppressed at 90Mbps by the 100Mbps version. This article explains the differences between the two versions, how to recognize them when you get them, and what they can do for each in 2026....

It's not worth a look at the router and optical modem because they're broken. I conducted a comprehensive check-up of my home network every month, quarterly, semi-yearly, and annually, identifying three hidden dangers: light decay drift, zombie binding, and UPS battery aging. The periodic table and criteria are all here....

The routing table isn't exclusive to the router; you have one on your computer. On the night of the business trip, I logged out of the VPN and ran around the whole network, but the ping gateway worked. When I checked the route print, I saw an extra 0.0.0.0 router and just wouldn't leave. Knowing where to go, the scope, and who to assign it to—three columns—this kind of pot can be pinpointed at a glance....

The entry point for changing DNS on Tenda routers is in the tendawifi.com's internet settings, while older AC series models are hidden in the WAN port settings under network parameters. The first and backup boxes cannot be filled with the same address; I only found out when I was rejected from my save. WeChat can send a webpage but it won't open, and changes won't take effect—this article explains everything in one detail....

Can a retired telecom optical modem at home be plugged into mobile broadband and still used? I tried using the HS8145V5 my cousin had taken out and plugging it into our own mobile secondary line overnight. The PON light kept flashing for 14 hours and I couldn't register. To break it down, the two locks that the light modem cannot bypass are the standard and the authentication method. This article explains both locks and the method for matching the number....

The second-hand drive in my cousin's NAS that lasted 40,000 hours was really dead. He even restarted it three times with a clicking sound. I accompanied him to visit two data recovery companies, with opening prices ranging from 1500 to 3500, and we saw every pitfall of low-price traffic and testing fees. This article discusses what money to spend and what actions to avoid after a broken disc....

Group broadcasts are only sent to those who subscribe. Watching IPTV live streams at home doesn't take up broadband megapixels, switching channels takes a second or two, casting only on the same WiFi is accessible—it's all the work behind the scenes. I'll break down the three delivery methods—unicast, radio, and multicast—and show you what multicast looks like....