11/11/2023 0 Comments Chrome for linuxWhen you try to load a website, your browser sends a query to your OS that it needs the IP for this domain name. Here is how a common format of a Resource Record looks like: All that data in a record file is in ASCII code, and there is a separate line for each domain name in it. Time to live (TTL) refers to the time (in seconds) a record is considered valid before a new DNS lookup has to be initiated. These records include requisites like Name, Record type, Time to Live (TTL), Class, Resource data, and Resource data length. The information stored in the DNS cache consists of Resource Records (RR) that hold the IP addresses of the domain names you frequently visit. The DNS cache is the temporary database of domain-to-IP translations your Operating System (OS) gathers. The user end of the DNS is called a DNS resolver (Stub Resolver) that queries the DNS cache reducing the load on upstream DNS servers. The Domain Name System (DNS) is a global naming system designed to map domain names to their corresponding server IP addresses. This article will focus on what is a DNS cache, how to determine the DNS resolver your Ubuntu is using, and how to flush the DNS in Linux Ubuntu. You have to instruct your Linux to flush the DNS cache on such occasions. This can lead to issues when loading your website in the browser. Oftentimes, though, this DNS cache may get invalid or corrupted. It allows your Linux machine to retrieve the DNS information locally, instead of waiting for the public DNS resolver. This happens due to the browser cache and the DNS cache your Linux Operating System collects. Perhaps you have come to notice that websites you visit frequently load much faster than others.
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