国科云提供域名管理、域名锁、智能解析、DDI、IPv6转换、SSL证书等一站式域名解决方案，并形成以云解析、云监控、云盾、云服务器为核心的云计算产品服务体系。
发布时间：2022-09-19 16:53:32
1. 域名状态异常你可以通过中科三方Whois查询工具查看你的域名当前所处的状态，如果域名处于以下几种状态时，域名无法被访问：Redemption period（域名过期，赎回期）Serverhold（注册局设置暂停解析）根据域名的解析流程可知，影响用户端域名解析是否生效主要取决于运营商提供的递归DNS服务器.........【阅读全文】
发布时间：2022-09-16 17:32:18
当我们第一次访问某个网站时，DNS在返回对应的IP地址后，系统会将这个记录临时存储下来，并为其设定一个有效期限（TTL），在有效期限内再次访问该网站，系统会直接将该结果返回，而无需求助DNS系统进行全球查询。这个临时储存下来的记录就是DNS缓存。如果超过DNS缓存的有效期限再次对该网站，系统会自动再次询问DNS服务器.........【阅读全文】
发布时间：2022-09-09 16:29:51
NS（Name Server）记录是域名服务器记录，用来指定该域名由哪个DNS服务器来进行解析。全球有很多DNS服务节点，在设置完解析记录后，会将此结果同步至全球各个DNS服务节点，这一过程所需要的时间即为解析生效的时间。（1）新增解析记录生效时间（2）修改解析记录生效时间（3）修改DNS解析生效时间中科.........【阅读全文】
发布时间：2022-09-07 16:59:07
通俗而言，当您需要配置智能线路时，比如中国联通和中国电信，配置完成以后，按照规则，联通的用户得到联通线路的解析结果，电信的用户得到电信线路的解析结果，那么电信和联通以外的所有用户呢？它们都去默认线路了，如果不配置默认线路，这部分用户将解析不到任何结果！联通用户通过域名，访问应用服务的IP地址：1..........【阅读全文】
发布时间：2022-09-06 15:17:41
IPv4协议是目前广泛部署的互联网协议。在互联网发展初期，IPv4以其协议简单、易于实现、互操作性好的优势而得到快速的发展。但随着互联网的迅猛发展，IPv4 的不足也日益凸显，例如地址空间不足、处理报文头及报文选项的复杂度高、地址维护工作量大、路由聚合效率低、对安全/QoS/移动性等问题缺乏有效的解决方案等。与.........【阅读全文】
JVDLFFLR2025-08-03 17:15
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