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Problem using DNS TCP query on service does not support IPv6
How do I configure IPv4 connection to use a DNS accessible only over IPv6?Ubuntu 14.04 - Network problems (wireless and DNS)DNS not resolving Seattle University network16.10 fail to resolve DNSIPv6 Problem with DNSMAAS node unable to resolve it's own hostnameUbuntu 16.04 LTS: Unable to resolve/ping hostnameDNS unable to resolve certain specific hostnames (eg fortune.com) Ubuntu 17.04BIND server won't resolve names on LAN¿How to use systemd-resolve instead of connman as DNS proxy?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
- Symptom
After adding "options use-vc" in /etc/resolv.conf, tools like wget/curl cannot resolve hostname any more. Dig/nslookup works. And if change the nameserver to 1.1.1.1, or 8.8.8.8, all work. - Research
After TCPDump with the cross matrix of wget/nslookup/myDNS/1.1.1.1. I found that:- wget makes both IPv4 and IPv6 queries in one request; nslookup only makes IPv4.
- 1.1.1.1 returns both IPv4 and IPv6 (resolve to CNAME, not IPv6 address) answer in one response; My DNS returns only IPv4.
- A testing code calling getaddrinfo works the same way as wget.
- Conclusion
With TCP DNS, glibc keeps asking in both IPv4 and IPv6, if the answer contains no IPv6, it fails.
Question: Is this by design? Why?
OS: Newly installed Ubuntu bionic LTS.
networking dns bind glibc
asked Apr 15 at 3:54
MagicloudMagicloud
2683 silver badges16 bronze badges
add a comment |
- Symptom
After adding "options use-vc" in /etc/resolv.conf, tools like wget/curl cannot resolve hostname any more. Dig/nslookup works. And if change the nameserver to 1.1.1.1, or 8.8.8.8, all work. - Research
After TCPDump with the cross matrix of wget/nslookup/myDNS/1.1.1.1. I found that:- wget makes both IPv4 and IPv6 queries in one request; nslookup only makes IPv4.
- 1.1.1.1 returns both IPv4 and IPv6 (resolve to CNAME, not IPv6 address) answer in one response; My DNS returns only IPv4.
- A testing code calling getaddrinfo works the same way as wget.
- Conclusion
With TCP DNS, glibc keeps asking in both IPv4 and IPv6, if the answer contains no IPv6, it fails.
Question: Is this by design? Why?
OS: Newly installed Ubuntu bionic LTS.
networking dns bind glibc
asked Apr 15 at 3:54
MagicloudMagicloud
2683 silver badges16 bronze badges
add a comment |
- Symptom
After adding "options use-vc" in /etc/resolv.conf, tools like wget/curl cannot resolve hostname any more. Dig/nslookup works. And if change the nameserver to 1.1.1.1, or 8.8.8.8, all work. - Research
After TCPDump with the cross matrix of wget/nslookup/myDNS/1.1.1.1. I found that:- wget makes both IPv4 and IPv6 queries in one request; nslookup only makes IPv4.
- 1.1.1.1 returns both IPv4 and IPv6 (resolve to CNAME, not IPv6 address) answer in one response; My DNS returns only IPv4.
- A testing code calling getaddrinfo works the same way as wget.
- Conclusion
With TCP DNS, glibc keeps asking in both IPv4 and IPv6, if the answer contains no IPv6, it fails.
Question: Is this by design? Why?
OS: Newly installed Ubuntu bionic LTS.
networking dns bind glibc
asked Apr 15 at 3:54
MagicloudMagicloud
2683 silver badges16 bronze badges
- Symptom
After adding "options use-vc" in /etc/resolv.conf, tools like wget/curl cannot resolve hostname any more. Dig/nslookup works. And if change the nameserver to 1.1.1.1, or 8.8.8.8, all work. - Research
After TCPDump with the cross matrix of wget/nslookup/myDNS/1.1.1.1. I found that:- wget makes both IPv4 and IPv6 queries in one request; nslookup only makes IPv4.
- 1.1.1.1 returns both IPv4 and IPv6 (resolve to CNAME, not IPv6 address) answer in one response; My DNS returns only IPv4.
- A testing code calling getaddrinfo works the same way as wget.
- Conclusion
With TCP DNS, glibc keeps asking in both IPv4 and IPv6, if the answer contains no IPv6, it fails.
Question: Is this by design? Why?
OS: Newly installed Ubuntu bionic LTS.
networking dns bind glibc
networking dns bind glibc
asked Apr 15 at 3:54
MagicloudMagicloud
2683 silver badges16 bronze badges
asked Apr 15 at 3:54
MagicloudMagicloud
2683 silver badges16 bronze badges
edited Apr 16 at 3:56
Magicloud
asked Apr 15 at 3:54
MagicloudMagicloud
2683 silver badges16 bronze badges
asked Apr 15 at 3:54
MagicloudMagicloud
2683 silver badges16 bronze badges
asked Apr 15 at 3:54
MagicloudMagicloud
2683 silver badges16 bronze badges
2683 silver badges16 bronze badges
add a comment |
add a comment |
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