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).
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: arubanetworks. com
Name: securelogin.
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: arubanetworks. com
Name: securelogin.
Address: 172.22.240.242
PING:
~$ ping securelogin. arubanetworks. com arubanetworks. com: Name or service not known
ping: securelogin.
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: arubanetworks. com. IN A
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;securelogin.
;; AUTHORITY SECTION: rks.com. hostmaster. arubanetworks. com. 1323935888 3600 200 1209600 86400
arubanetworks.com. 1991 IN SOA dns5.arubanetwo
;; Query time: 34 msec 222.222# 53(208. 67.222. 222)
;; SERVER: 208.67.
;; 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: arubanetworks. com. IN A
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;securelogin.
;; Query time: 0 msec 53#53(127. 0.0.53)
;; SERVER: 127.0.0.
;; WHEN: Wed Oct 25 10:34:01 CEST 2017
;; MSG SIZE rcvd: 58