How to clear DNS cache in 18.04

Question

Please don't flag this question as a duplicate because I really need your help. I once used OpenDNS in my router to block some websites & now I'm stuck with at whatever I do. I have already removed OpenDNS from my router & tried half of the commands suggested in other question but none of them work for me. Most of the websites which deal with a proxy, adult content etc. are all blocked & I'm requesting for a solution.

Please don't flag this question as a duplicate - It is a duplicate. The correct answers are https://askubuntu.com/a/909173/446317 and https://askubuntu.com/a/907558/446317 https://askubuntu.com/a/929478/446317 - that's 3 correct answers in two other questions. Duplicate. — Phil, Feb 18 '19 at 22:00

score 14 · Answer 1 · answered Nov 13 '18 at 12:36

14

This should clear it

# sudo systemd-resolve --flush-cache

You can check with

# sudo systemd-resolve --statistics

it should show 0 in Current cache size

DNSSEC supported by current servers: no
Transactions
Current Transactions: 0
Total Transactions: 93750

Cache
  Current Cache Size: 0
  Cache Hits: 18686
Cache Misses: 28576

DNSSEC Verdicts
      Secure: 0
    Insecure: 0
       Bogus: 0
Indeterminate: 0

answered Nov 13 '18 at 12:36

Morgan Cox

141

1

My current cache is still not 0 – Goutam Hebbar Nov 21 '18 at 15:43
You need to get into the ROUTER settings and flush the cache there as that's where your DNS lookups entries are cached, not on your local computer. If you need help with that, you might want to visit a forum that focuses on your router model. – Compatico Jan 23 '19 at 00:16
@Michael what version of Linux are you using ? – Morgan Cox Feb 05 '19 at 14:03

score 1 · Answer 2 · answered Feb 11 '21 at 13:58

1

Maybe this version also has two (2) DNS caches, like Ubuntu 20.10.

Please check the full tutorial to flush DNS caches:

https://askubuntu.com/a/1315569/136919

answered Feb 11 '21 at 13:58

PabloRQ

179

How to clear DNS cache in 18.04

2 Answers2