换了服务器、改了域名指向，却没立刻生效——这是 DNS 解析在起作用。
一句话解释
DNS 是把域名翻译成 IP 的”电话簿”。你访问网站时：域名 → DNS 解析出 IP → 再连到那台服务器。
常见记录类型
为什么改了要等
TTL（缓存时间）决定解析结果被缓存多久。改了记录要等旧 TTL 过期才全网生效（几分钟到几小时）。换服务器前先把 TTL 调小，切换更快。
提醒
“解析正常但还是连不上”——可能 IP 解析得到了，但该 IP 被墙 了，这是两码事。
挑合适的在售机型？去 库存监控 按线路 / 地区筛选。
You’ve switched servers or updated your domain’s DNS records — but the change didn’t take effect immediately. That’s DNS propagation at work.
One-Line Explanation
DNS is the “phone book” that translates domain names into IP addresses. When you visit a website: domain name → DNS resolves it to an IP → your browser connects to that server.
Common Record Types
- A: domain → IPv4 address; AAAA: domain → IPv6 address
- CNAME: points to another domain name (commonly used when routing through a CDN); MX: mail server
Why You Have to Wait After Making a Change
TTL (Time To Live) determines how long a DNS record is cached. After you update a record, the old result stays cached until the TTL expires before the change spreads globally (anywhere from a few minutes to a few hours). Lower the TTL before switching servers to speed up the cutover.
Heads Up
“DNS resolves correctly but I still can’t connect” — the IP resolved fine, but that IP may be blocked. That’s a separate issue entirely.
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