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Giovanni Scordilli
n00b
Joined: 11 Aug 2024
Posts: 6
Location: Italy
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 Posted: Sun Aug 11, 2024 11:09 am Post subject: DNS issue on new Gentooo machine |
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I Installed a fresh Gentoo system in my main machine. I've a dully issue with DNS. If i try to ping IP adress it's ok:
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DESKTOP-giovanni ~ # ping -c 1 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=116 time=7.81 ms
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 7.811/7.811/7.811/0.000 ms
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Also I can navigate normally with FireFox.
Instead if I ping website adress this is the result:
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DESKTOP-giovanni ~ # ping -c 1 google.it
PING google.it (2a00:1450:4002:414::2003) 56 data bytes
--- google.it ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms
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I already tried to edit the /etc/resolv.conf and make it immutable:
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nameserver 8.8.8.8
nameserver 1.1.1.1
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| Code: |
chattr +i /etc/resolv.conf
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Than I reboot but nothing change.
I also tried to disable IPV6 on my modem but no result again.
Finally I tried to use my smartphone's HotSpot. With this connection all things work, but obviously I cannot use forever my HotSpot.
I've already search all possible things on the web but I didn't find anything...
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 22613
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| Posted: Sun Aug 11, 2024 2:18 pm Post subject: Re: DNS issue on new Gentooo machine |
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Welcome to the forums. | Giovanni Scordilli wrote: | | Code: | DESKTOP-giovanni ~ # ping -c 1 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=116 time=7.81 ms
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 7.811/7.811/7.811/0.000 ms |
Also I can navigate normally with FireFox.
Instead if I ping website adress this is the result: | Code: | DESKTOP-giovanni ~ # ping -c 1 google.it
PING google.it (2a00:1450:4002:414::2003) 56 data bytes
--- google.it ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms |
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This looks to me like DNS worked properly. Why do you think you have a DNS problem? To me, this looks like an issue where you try to use IPv6, but IPv6 does not actually work. | Giovanni Scordilli wrote: | I already tried to edit the /etc/resolv.conf and make it immutable: | Code: | | chattr +i /etc/resolv.conf |
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Why did you do that? Both those changes look wrong to me. You should use the DNS servers provided by your DHCP server.
What happens if you try ping -c 1 -4 google.it? What error messages do you see for non-working connections? Does google.it ever respond to ICMP echo requests? Some systems ignore them. |
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Giovanni Scordilli
n00b
Joined: 11 Aug 2024
Posts: 6
Location: Italy
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| Posted: Sun Aug 11, 2024 3:11 pm Post subject: Re: DNS issue on new Gentooo machine |
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| Hu wrote: | Welcome to the forums. | Giovanni Scordilli wrote: | | Code: | DESKTOP-giovanni ~ # ping -c 1 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=116 time=7.81 ms
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 7.811/7.811/7.811/0.000 ms |
Also I can navigate normally with FireFox.
Instead if I ping website adress this is the result: | Code: | DESKTOP-giovanni ~ # ping -c 1 google.it
PING google.it (2a00:1450:4002:414::2003) 56 data bytes
--- google.it ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms |
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This looks to me like DNS worked properly. Why do you think you have a DNS problem? To me, this looks like an issue where you try to use IPv6, but IPv6 does not actually work. | Giovanni Scordilli wrote: | I already tried to edit the /etc/resolv.conf and make it immutable: | Code: | | chattr +i /etc/resolv.conf |
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Why did you do that? Both those changes look wrong to me. You should use the DNS servers provided by your DHCP server.
What happens if you try ping -c 1 -4 google.it? What error messages do you see for non-working connections? Does google.it ever respond to ICMP echo requests? Some systems ignore them. |
Thank you for the answer! (and sorry if my english isn't optimal)
I tried what you say and disable the immutable with: | Code: | | chattr -i /etc/resolv.conf |
This is the output:
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DESKTOP-giovanni /home/giovanni # ping -c 1 -4 google.it
PING google.it (216.58.204.131) 56(84) bytes of data.
64 bytes from par21s05-in-f3.1e100.net (216.58.204.131): icmp_seq=1 ttl=117 time=7.39 ms
--- google.it ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 7.390/7.390/7.390/0.000 ms
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Actually it works but if i try to use emerge or other software they fail.
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kimchi_sg
Advocate
Joined: 26 Nov 2004
Posts: 3038
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| Posted: Sun Aug 11, 2024 3:15 pm Post subject: Re: DNS issue on new Gentooo machine |
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| Giovanni Scordilli wrote: | | Actually it works but if i try to use emerge or other software they fail. |
Eh, you mentioned Firefox can open websites? |
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Giovanni Scordilli
n00b
Joined: 11 Aug 2024
Posts: 6
Location: Italy
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| Posted: Sun Aug 11, 2024 3:24 pm Post subject: Re: DNS issue on new Gentooo machine |
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| kimchi_sg wrote: | | Giovanni Scordilli wrote: | | Actually it works but if i try to use emerge or other software they fail. |
Eh, you mentioned Firefox can open websites? |
Yes, but other software like thunderbird and emerge no.
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 22613
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| Posted: Sun Aug 11, 2024 3:26 pm Post subject: |
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The new results further support my suggestion, that IPv6 resolution is used, but that IPv6 connectivity is broken. Per Guidelines item #4, please show us a command that fails, and the full output it produces.
Firefox reimplements so much logic that it is a poor test in this case. My guess is some combination of it using DNS-over-HTTPS (DoH!) to a server that is not resolving IPv6 addresses or that Firefox has its own logic to recover from receiving unusable IPv6 addresses.
Alternately, change /etc/gai.conf to prefer IPv4 addresses. |
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Giovanni Scordilli
n00b
Joined: 11 Aug 2024
Posts: 6
Location: Italy
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| Posted: Sun Aug 11, 2024 7:38 pm Post subject: |
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| Hu wrote: | The new results further support my suggestion, that IPv6 resolution is used, but that IPv6 connectivity is broken. Per Guidelines item #4, please show us a command that fails, and the full output it produces.
Firefox reimplements so much logic that it is a poor test in this case. My guess is some combination of it using DNS-over-HTTPS (DoH!) to a server that is not resolving IPv6 addresses or that Firefox has its own logic to recover from receiving unusable IPv6 addresses.
Alternately, change /etc/gai.conf to prefer IPv4 addresses. |
Thank you for the answer!
I retried to turn off IPv6 from my modem, and after reboot all things work properly!
Thank you so much for the help!!!
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