Resolve:
systemd-resolve -t MX gmail.com #show mail server
systemd-resolve -t SOA gmail.com #show SOA . Start Of Authority (More administrative information) URL
systemd-resolve 85.214.157.7 #Get domain name
nslookup domain.ir [#Finding The IP Address of an Host from default dns server]
nslookup domain.ir 8.8.8.8[#Finding The IP Address of an Host From non default dns server]
nslookup -querytype=mx domain.ir[ #Find Mail Servers for a Domain]
nslookup -query=mx domain.ir [#Find Mail Servers]
nslookup -query=ns domain.ir [ #Find NameServers]
nslookup -query=soa domain.ir [ #display the SOA record (information about the domain]
nslookup -query=any domain.ir [ #display all the available DNS records]
host -la domain.com [Show all record with Information]
dig Domain.it axfr [Show all record with Information]
systemd-resolve --statistics #informations
Flush the DNS Cache URL
Method 1: Using systemd-resolve to flush DNS-Cache
sudo systemd-resolve --flush-caches
sudo systemd-resolve --statistics
Method 2: Using dns-clean to flush DNS-Cache
sudo /etc/init.d/dns-clean start
Resolve.conf
Install:
sudo apt install resolvconf
For fix and NotChange file:
vim /etc/NetworkManager/NetworkManager.conf
#Add below to main area :
dns=none