nslookup is a network administration tool for querying the Domain Name System (DNS) to obtain domain name or IP address mapping or any other specific DNS record. It is also used to troubleshoot DNS related problems. This article provides few examples on using the nslookup command.
Mar 13, 2020 · Check its value. If the value is zero, it means that caching is disabled on the system. Note: If you want to enable DNS caching on Linux, you can do so by using the command “sudo dnsmasq -c 150”. You can use any number in place of 150, which is basically the number of entries that dnsmasq can cache. Dig (on Mac OS X and Linux) and nslookup (on Microsoft Windows) are the primary command-line tools for troubleshooting DNS issues. While web-based tools are convenient and easy to use, it is often faster to use a command-line tool on your own system. The exact steps to do this depend on your computer's operating system. As DNS is an important service being able to troubleshoot it is a useful skill. By default Linux will first check it’s local host file /etc/hosts before querying DNS servers defined in /etc/resolv.conf. It is important to confirm that the correct DNS servers have been specified within this file and that you can connect to them on TCP/UDP port 53. May 21, 2016 · In simple terms, Nslookup queries a local or the remote DNS servers to dig out information about the requested domain. You can also use many variants of this command on CMD to find out more and Check Point only demonstrated that it could crash a target DNS server with that phishing trick, not hijack it. But Jake Williams, a former National Security Agency hacker and founder of Rendition
Reverse dns lookup. We can check the rDNS for the IP using the nslookup command. You can check the screenshot for the same. We can query specific dns record using the nslookup command by specifying the type. See the checking of MX record check in the screenshot. You can check the interactive mode from the following screenshot. host
Sep 07, 2019 · There's an online DNS leak checker named DNSleaktest.com, where you could check for DNS leak very easily. Go to that site and click on the Standard test or Extended test button what ever you like and check the results. If there is any result with a IP address related to your real IP and ISP default DNS servers that means your DNS is leaking.