Yes, this is a captive portal situation on up-to-date 17.10. The captive
portal popup fails with a DNS error looking for
securelogin.arubanetworks.com and then hilarity ensues. Manually editing
/etc/resolv.conf to use one of these DNS servers makes it all work. So
the problem is systemd-resolved which is the default resolv.conf:
~$ cat /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.53
search invitados
It's all NM:
~$ cat /etc/netplan/01-network-manager-all.yaml
# Let NetworkManager manage all devices on this system
network:
version: 2
renderer: NetworkManager
Should /etc/resolv.conf be a symlink?
libnss-resolve is not installed.
systemd-resolve --status shows the two local DNS servers, as above.
~$ systemd-resolve --status | cat -
Global
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 7 (wwp0s20f0u6i12)
Current Scopes: none
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
Link 4 (wlp4s0)
Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
DNS Servers: 208.67.222.222
208.67.220.220
DNS Domain: invitados
Link 2 (enp0s31f6)
Current Scopes: none
LLMNR setting: yes
MulticastDNS setting: no
DNSSEC setting: no
DNSSEC supported: no
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1727237
Title:
systemd-resolved is not finding a domain
Status in systemd package in Ubuntu:
Incomplete
Bug description:
I have an odd network situation that I have so far managed to narrow
down to the inability to resolve a domain via systemd-resolved which
is resolvable with nslookup. If I use nslookup against the two
nameservers on this network I get answers for the domain, but ping
says it is unable to resolve the same domain (as do browsers and
crucially the captive portal mechanism).
Here are details:
NSLOOKUP:
~$ nslookup securelogin.arubanetworks.com 208.67.220.220
Server: 208.67.220.220
Address: 208.67.220.220#53
Non-authoritative answer:
Name: securelogin.arubanetworks.com
Address: 172.22.240.242
~$ nslookup securelogin.arubanetworks.com 208.67.222.222
Server: 208.67.222.222
Address: 208.67.222.222#53
Non-authoritative answer:
Name: securelogin.arubanetworks.com
Address: 172.22.240.242
PING:
~$ ping securelogin.arubanetworks.com
ping: securelogin.arubanetworks.com: Name or service not known
mark@mark-X1Y2:~$
DIG:
~$ dig @208.67.222.222 securelogin.arubanetworks.com
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @208.67.222.222 securelogin.arubanetworks.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 9416
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;securelogin.arubanetworks.com. IN A
;; AUTHORITY SECTION:
arubanetworks.com. 1991 IN SOA dns5.arubanetworks.com.
hostmaster.arubanetworks.com. 1323935888 3600 200 1209600 86400
;; Query time: 34 msec
;; SERVER: 208.67.222.222#53(208.67.222.222)
;; WHEN: Wed Oct 25 10:31:10 CEST 2017
;; MSG SIZE rcvd: 144
MORE DIG:
~$ dig securelogin.arubanetworks.com
; <<>> DiG 9.10.3-P4-Ubuntu <<>> securelogin.arubanetworks.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 3924
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;securelogin.arubanetworks.com. IN A
;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Wed Oct 25 10:34:01 CEST 2017
;; MSG SIZE rcvd: 58
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