Traceroute is one of the popular tools for network inspection. It shows the IP addresses of routers on the route from your computer to a destination server, similar to: Domains are shown on the last 2 hops, which is the IP's reverse DNS record. Reverse DNS records exist as PTR records in the format of 4.3.2.1.in-addr.arpa . For more information, you may refer to Setting IP Reverse Records in DN42 (Chinese Only) . Naturally, where there are characters, there will be stories shown in them. Two years ago, I set up a bunch of Docker containers, and modified and chained their routing tables, so they create the path needed for showing the essay . Using a lot of containers isn't elegant enough, and is a management burden, especially if the path is long....

During the Chinese Spring Festival, my dad gave me an Edifier M120 Bluetooth speaker. This speaker is not one of these high-end models featuring dedicated bass speakers or professional Bluetooth audio codecs such as aptX and LDAC; it's just a unit with two ordinary speakers. With that said, I doubt I can hear any difference with those advanced codecs on a portable speaker anyway. But when I played some music with my phone connected to it, I realized that it does have some bass output. Speaking of bass, I'm impressed by a JBL Charge 4 speaker bought by one of my classmates. As a portable speaker that costs 150 , i t h a s a d e d i c a t e d b a s s u n i t w i t h a s t o n i s h i n g p o w e r . T h e n I b e g a n t o t h i n k t h a t ,...