I've installed Ubuntu 20.04 and I'm not getting IPv6 to work. Can someone help me, please?
$ resolvectl -6 query google.com
google.com: 2a00:1450:4003:801::200e -- link: wlo1
-- Information acquired via protocol DNS in 16.2ms.
-- Data is authenticated: noOK
$ resolvectl -6 query askubuntu.com
askubuntu.com: resolve call failed: 'askubuntu.com' does not have any RR of the requested typeFAIL
$ resolvectl -4 query askubuntu.com
askubuntu.com: 151.101.1.69 -- link: wlo1 151.101.65.69 -- link: wlo1 151.101.193.69 -- link: wlo1 151.101.129.69 -- link: wlo1
-- Information acquired via protocol DNS in 18.3ms.
-- Data is authenticated: noOK if IPv4 is used.
$ cat /var/run/NetworkManager/resolv.conf
# Generated by NetworkManager
nameserver 127.0.0.53
$ cat /var/run/NetworkManager/no-stub-resolv.conf
# Generated by NetworkManager
nameserver 8.8.8.8[Output when connected using IPv4]
$ cat /var/run/NetworkManager/resolv.conf
# Generated by NetworkManager
nameserver 127.0.0.53
$ cat /var/run/NetworkManager/no-stub-resolv.conf
# Generated by NetworkManager
nameserver 2001:4860:4860::8888[Output when connected using IPv6]
$ systemd-resolve --status
Global LLMNR setting: no
MulticastDNS setting: no DNSOverTLS setting: no DNSSEC setting: no DNSSEC supported: no DNSSEC NTA: 10.in-addr.arpa 16.172.in-addr.arpa 168.192.in-addr.arpa 17.172.in-addr.arpa 18.172.in-addr.arpa 19.172.in-addr.arpa 20.172.in-addr.arpa 21.172.in-addr.arpa 22.172.in-addr.arpa 23.172.in-addr.arpa 24.172.in-addr.arpa 25.172.in-addr.arpa 26.172.in-addr.arpa 27.172.in-addr.arpa 28.172.in-addr.arpa 29.172.in-addr.arpa 30.172.in-addr.arpa 31.172.in-addr.arpa corp d.f.ip6.arpa home internal intranet lan local private test
Link 2 (wlo1) Current Scopes: DNS
DefaultRoute setting: yes LLMNR setting: yes
MulticastDNS setting: no DNSOverTLS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 2001:4860:4860::8888 DNS Domain: ~.$ cat /etc/nsswitch.conf
# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.
passwd: files systemd
group: files systemd
shadow: files
gshadow: files
hosts: files resolve [!UNAVAIL=return] dns
networks: files
protocols: db files
services: db files
ethers: db files
rpc: db files
netgroup: nisEDIT:There was a problem. I could not access askubuntu.com website. The problem was on my NetworkManager configuration. I've set the IPv4 method as "disabled", when I what I really intended was to only "Require IPv6 addressing for this connection to complete". Cool behavior though!
02 Answers
Looking from here, it doesn't seem askubuntu.com has any AAAA (IPv6) DNS records. Not everything does, after all. So it's not that you haven't visited it before, it's that it just doesn't exist for anybody.
1Use dig and specify AAAA as the record type to determine if the issue is network related or system related.
root@ubuntu:~# dig google.com AAAA
; <<>> DiG 9.10.3-P4-Ubuntu <<>> google.com AAAA
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64485
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1452
;; QUESTION SECTION:
;google.com. IN AAAA
;; ANSWER SECTION:
google.com. 240 IN AAAA 2607:f8b0:4006:804::200e
;; Query time: 2 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed May 06 21:21:59 UTC 2020
;; MSG SIZE rcvd: 77If this works it will at least narrow down the scope of your issue.
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