Am 2017-07-04 15:37, schrieb Alessandro Selli:

>
> I really wonder what did mxtoolbox.com check, as I cannot see what
> dns.org
> and shockmedia.com have to do with dyne.org:

That's strange. Something in my test changed dyne.org magically to
dns.org. But that was not me, I used cut&paste ;-)

The only explanation I have is, that sometimes there is overload at
dyne.org dns servers. The TTL values are really low and prevent mostly
caching.

$ dig tupac2.dyne.org

; <<>> DiG 9.9.5-9+deb8u11-Debian <<>> tupac2.dyne.org
;; global options: +cmd
;; connection timed out; no servers could be reached

$ dig tupac2.dyne.org

; <<>> DiG 9.9.5-9+deb8u11-Debian <<>> tupac2.dyne.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37556
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 4

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;tupac2.dyne.org.        IN    A

;; ANSWER SECTION:
tupac2.dyne.org.    300    IN    A    178.62.188.7

;; AUTHORITY SECTION:
dyne.org.        900    IN    NS    ns.dyne.org.
dyne.org.        900    IN    NS    ns2.dyne.org.
dyne.org.        900    IN    NS    ns3.dyne.org.

;; ADDITIONAL SECTION:
ns.dyne.org.        300    IN    A    188.166.98.127
ns2.dyne.org.        300    IN    A    198.199.70.248
ns3.dyne.org.        300    IN    A    178.21.114.142

;; Query time: 657 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Jul 04 17:22:16 CEST 2017
;; MSG SIZE rcvd: 161