Ubuntu 20.04 LTS : is DNS solver is really buggy?

ledufAkaDemy ledufAkaDemy

5/21/23, 10:42 AM

my ubuntu desktop is receiving DNS server via DHCP server (a pfsense router).

systemd-resolve --status


Global
       LLMNR setting: no                  
MulticastDNS setting: no                  
  DNSOverTLS setting: no                  
      DNSSEC setting: no                  
    DNSSEC supported: no                  
  Current DNS Server: 10.0.0.254          
         DNS Servers: 10.0.0.254 
         ....

Link 2 (enp37s0)
      Current Scopes: DNS         
DefaultRoute setting: yes         
       LLMNR setting: yes         
MulticastDNS setting: no          
  DNSOverTLS setting: no          
      DNSSEC setting: no          
    DNSSEC supported: no          
  Current DNS Server: 10.0.0.254  
         DNS Servers: 10.0.0.254

In my pfsense have got dns static entry (dnsmasq)

inter.mydom.cloud => 192.168.1.253
alias gitlab.mydom.cloud
alias fw666.mydom.cloud

A ping result is juste weird :

First ping =
ping gitlab.mydom.cloud
PING gitlab.mydom.cloud (192.168.1.253) 56(84) bytes of data.
64 octets de gitlab.mydom.cloud (192.168.1.253) : icmp_seq=1 ttl=61 temps=0.797 ms

Second ping =
ping gitlab.mydom.cloud
PING website.mydom.cloud (78.66.60.110) 56(84) bytes of data.
64 octets de car78-2_migr-78-66-60-110.fbx.proxad.net (78.66.60.110) : icmp_seq=1 ttl=63 temps=0.441 ms

and DNS solving is broken !! So i need to :

sudo systemd-resolve --flush-caches

... again first ping working !!!!

Is it a bug ?

Info: mydom.cloud exist on the web, the zone only have one A record website.mydom.cloud, and for external dns request gitlab.mydom.cloud CNAME to my public home ip.
Windows 10 in the same netwok doesn't' this issue, ping is working the same ways twice etc.

So i think systemd-resolve completly bypass my pfsense dnsmasq server and go to web root dns!!!!

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networking

dns

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Ubuntu 20.04 LTS : is DNS solver is really buggy?

TH: Ubuntu 20.04 LTS: ตัวแก้ DNS นั้นมีปัญหาจริงหรือ

RO: Ubuntu 20.04 LTS: solutorul DNS este cu adevărat greșit?

RU: Ubuntu 20.04 LTS: действительно ли решатель DNS глючит?

VI: Ubuntu 20.04 LTS: bộ giải DNS có thực sự có lỗi không?

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