The host itself does not handle the actual FQDN. That is handled by the DNS. FQDN (Fully Qualified Domain Name) is handled by DNS translating names into IP addresses. Using the /etc/hosts file, you are essentially overriding the DNS server.

By default the pure Go resolver is used, because a blocked DNS request consumes only a goroutine, while a blocked C call consumes an operating system thread. When cgo is available, the cgo-based resolver is used instead under a variety of conditions: on systems that do not let programs make direct DNS requests (OS X), when the LOCALDOMAIN environment variable is present (even if empty), when the RES_OPTIONS or HOSTALIASES environment variable is non-empty, when the ASR_CONFIG environment variable is non-empty (OpenBSD only), when /etc/resolv.conf or /etc/nsswitch.conf specify the use of features that the Go resolver does not implement, and when the name being looked up ends in .local or is an mDNS name.

The Inflexibility of DNS Traditionally, the root record of a domain needed to point to an IP address (known as an A -- for "address" -- Record). While it may not seem like a big deal, tying a service to an IP address can be extremely limiting.

我有特别的 DNS 配置和使用技巧

dns做得负载均衡，为什么通过top命令查看每台机器负载相差很大？

DNS如何实现全局负载均衡？

On the internet today, it seems like it’s more common to use “absolute” domain names (like example.com).

The technical term for “THIS IS THE WHOLE THING” is “fully qualified domain name” or “FQDN”. So google.com. is a fully qualified domain name, and google.com isn’t.

So because domain names can actually be translated to something else in some cases, people like to put a "." at the end to communicate “THIS IS THE DOMAIN NAME, NOTHING GETS ADDED AT THE END, THIS IS THE WHOLE THING”.

zone files require a trailing dot at the end of a domain name (because otherwise they’re interpreted as being relative to the zone).

a fully qualified domain name is a domain with a “.” at the end!

Mais la justice fait face à un autre problème bien plus difficile à régler. Le blocage par les FAI n'est en effet efficace que si les internautes se servent des réglages DNS de base de leur fournisseur. Une simple modification permet donc de les contourner et de retrouver par conséquent un accès à la Z-Lib. Le seul moyen d'en couper définitivement l'accès serait donc d'en trouver les serveurs et de les désactiver. Une mission particulièrement ardue : ceux-ci sont disséminés dans de nombreux pays… dont la Russie, qui n'est peut-être pas encline à suivre les recommandations de la justice française actuellement.

The bearerURI for a VHF/FM service is compiled as follows:fm:<gcc>.<pi>.<frequency>The <frequency> element may be replaced by the asterisk ("*") character to signify any frequency. In this case the PIcode alone shall be used by the device to locate the source

nslookup -type=CNAME 09880.c201.ce1.fm.radiodns.org

权威各种DNS有什么区别？比如帝恩思小编的电脑上配置的是DNS114.114.114.114，但是www.dns.com用的是帝恩思dns.com的DNS，这两种DNS有什么区别？这里就做一些解释。首先，DNS按功能（角色）的分类：1.权威DNS：权威DNS是经过上一级授权对域名进行解析的服务器，同时它可以把解析授权转授给其他人，如COM顶级服务器可以授权dns.com这个域名的的权威服务器为NS.ABC.COM，同时NS.ABC.COM还可以把授权转授给NS.DDD.COM，这样NS.DDD.COM就成了ABC.COM实际上的权威服务器了。平时我们解析域名的结果都源自权威DNS。比如dns.com的权威DNS服务器就是帝恩思的ns1.dns.com ns2.dns.com2.递归DNS:负责接受用户对任意域名查询，并返回结果给用户。递归DNS可以缓存结果以避免重复向上查询。我们平时使用最多的就是这类DNS，他对公众开放服务，一般由网络运营商提供，大家都自己可以架递归DNS提供服务。递归DNS一定要有可靠的互联网连接方可使用。比如谷歌的8.8.8.8和8.8.4.4以及114的114.114.114.114和114.114.115.115都属于这一类DNS。你本地电脑上设置的DNS就是这类DNS。3.转发DNS:负责接受用户查询，并返回结果给用户。但这个结果不是按标准的域名解析过程得到的，而是直接把递归DNS的结果转发给用户。它也具备缓存功能。他主要使用在没有直接的互联网连接，但可以连接到一个递归DNS那里，这时使用转发DNS就比较合适。其缺陷是：直接受递归DNS的影响，服务品质较差。比如我们用的路由器里面的DNS就是这一类，用路由器的朋友可以看下本地电脑的DNS一般都是192.168.1.1。

You can add custom domains to any Heroku app. Adding domains does not incur extra charges.

The point of DoH is to bypass any other DNS or censorship further down the line.If you want to use DoH AND your hosts file then you need to use DoH as your OS's DNS so it is after the hosts file.

And the latter (DHCP server) is great because it means that all machines connecting to your router will now have their DNS requests routed through your Pi-Hole.

This means that the request had pass to the external network but did not come back...

If you're already an admin for the zone in question, then the proper way to get that information is to log on to the DNS server or DNS control console and read it right from there. If you're not an admin for the zone, you're not supposed to have that information. Note that the person you are talking to on the phone is almost certainly not a DNS zone admin, so they also should not have that information. If they somehow did have it, they definitely shouldn't give it out over the phone. This is for your protection.

DNS zone information is sensitive. Many years ago it was possible for anyone to query a DNS server and literally get back all the records at once, but that was a security issue. Now you have to be an admin for the zone to get that info.

CNAME RR

CNAME A <domain-name> which specifies the canonical or primary name for the owner. The owner name is an alias.

My next move will be to further lower my visibility to 3rd party tracking with a combination of pi-hole caching DNS blocker and wireguard VPN .

Authors of third-party tools should prefix each label key with the reverse DNS notation of a domain they own, such as com.example.some-label.

With a single source IP address it's possible to quickly determine the type of devices on their network, and the social networks they frequent – Google, YouTube, Facebook, Soichat.com, TikTok, Line (a chat application), among many other domains.

To add insult to injury I learn that when Cloudflare automatically detects an anomaly with your domain they permanently delete all DNS records. Mine won't be difficult to restore, but I'm not sure why this is necessary. Surely it would be possible for Cloudflare to mark a domain as disabled without irrevocably deleting it? Combined with the hacky audit log, I'm left with the opinion that for some reason Cloudflare decided to completely half-ass the part of their system that is responsible for deleting everything that matters to a user.

enter a forward to http://www.mydomain.com in the "Forward My Domain" section of the Domain Details tab, rather than setting up something in the Forwards tab