Comment 0 for bug 1727237

Mark Shuttleworth (sabdfl) wrote :

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