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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....

Both the Xiaomi Router 3 and mini use the old MT7620 platform, and the 100MB port as the main router is no longer sufficient. I pressed five steps to turn the one in the drawer into a Padavan, connected to my mom's home TV as a device-level bypass router to block ads, and stepped into every pitfall for you....

My wife saw news about the camera's illegal industry and turned to ask if my six heads were safe. I found the router port from the cloud account, then the camera's device, and after five steps, the riskiest spot was the 554 port on the router that the owner in the yard had opened via UPnP. Just follow this checklist and go through it once....

switches use MAC address tables to look up and forward, and packets that are unfamiliar are flooded to all ports. Two network cables connect the router and switch into a loop, with broadcast frames infinitely copied within the loop, filling the entire house with bandwidth in seconds. This article thoroughly explains the investigation process and principles behind the entire internet paralysis at my home in one go. ...

My cousin's Mercury router kept showing requests failing when binding MERCURY ID. The official customer service asked me to change the WAN port DNS, but no matter how many times I checked the WAN port settings, I couldn't find this box. This article notes the real entry point for changing DNS on Mercury, how to choose DNS, and three pitfalls where the fix doesn't take effect. The ugly saying that DNS doesn't speed up is also mentioned upfront....

At night, the internet suddenly disconnected while watching TV. The light modem was all green, and the WiFi was full. After checking for a long time, it turned out the main card for the integrated package was 17.3 yuan in call credit, and the broadband was suspended due to a convergence incident. Paying off outstanding fees is only the first step. Restarting the optical modem, waiting for the re-operation command to be issued, distinguishing between shutdown to keep accounts and undue fees and downtime—this article covers the entire process of resuming the machine....

After cleaning the ashes and turning it on, the 4T Cool Wolf disappeared from the storage pool. The first reaction disk crashed, and I almost ordered a new one. Disk spinning or not, SATA cable clipping, startup current, drive backplate—if you check in this order, one of the four slots is yours, and most of the time the drive is innocent....

My cousin's NAS had another issue: ping kept coming in and losing it, and Synology even detected IP conflicts in the background. He had him type arp -a twice remotely, and the MAC address corresponding to the same IP was changing, confirming that two devices were competing for one address. What is ARP, how to read the ARP table, and how to spot conflicts with free ARP—this article explains everything clearly....

The Xiaomi BE7000 has four ports all 2.5G, plus USB 3.0. The launch price is 799 yuan, now around 500 yuan. 2-gigabit broadband measured 1880 Mbps wired, NAS increased from 110MB/s to 290. But it's not a 10-gigabit router, nor does it have a flashing ecosystem. Who should buy it, who can save money? This article explains everything clearly....