DNS Flush

Arch

Clear DNS cache:

sudo systemctl restart nscd

 

Debian

Clear DNS cache:

sudo service network-manager restart

 

Ubuntu 18 + Ubuntu 20

Show statistics:

sudo systemd-resolve --statistics

$ sudo systemd-resolve --statistics
DNSSEC supported by current servers: no

Transactions              
Current Transactions: 0   
  Total Transactions: 1036
                          
Cache                     
  Current Cache Size: 24  
          Cache Hits: 535 
        Cache Misses: 678 
                          
DNSSEC Verdicts           
              Secure: 0   
            Insecure: 0   
               Bogus: 0   
       Indeterminate: 0

 

Clear DNS cache:

sudo systemd-resolve --flush-caches

$sudo systemd-resolve --flush
$ sudo systemd-resolve --statistics
DNSSEC supported by current servers: no

Transactions              
Current Transactions: 0   
  Total Transactions: 1044
                          
Cache                     
  Current Cache Size: 2   
          Cache Hits: 535 
        Cache Misses: 686 
                          
DNSSEC Verdicts           
              Secure: 0   
            Insecure: 0   
               Bogus: 0   
       Indeterminate: 0

 

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