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[linux_var] strano comportamento sui nomi di dominio inesistenti

Ciao a tutti,

ho notato sul mio PC uno strano comportamento con i nomi di dominio inesistenti.
Praticamente il mio PC "risolve" i nomi inesistenti con un indirizzo dei miei server.
Non ci sono cablati in /etc/hosts, non so dove guardare...
Avete qualche consiglio...

Allego sequenza comandi:


orlangio@DELL-E6430:~$ ping casa.mia
PING s2contabo2015.settebello.info (5.189.145.140) 56(84) bytes of data.
^C
--- s2contabo2015.settebello.info ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms

orlangio@DELL-E6430:~$ ping casa.tua
PING s2contabo2015.settebello.info (5.189.145.140) 56(84) bytes of data.
^C
--- s2contabo2015.settebello.info ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1006ms

orlangio@DELL-E6430:~$ ping casa.nostra
PING s2contabo2015.settebello.info (5.189.145.140) 56(84) bytes of data.
^C
--- s2contabo2015.settebello.info ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1006ms



orlangio@DELL-E6430:~$ nslookup casa.mia
Server: 8.8.8.8
Address: 8.8.8.8#53

** server can't find casa.mia: NXDOMAIN

orlangio@DELL-E6430:~$ nslookup casa.tua
Server: 8.8.8.8
Address: 8.8.8.8#53

** server can't find casa.tua: NXDOMAIN

orlangio@DELL-E6430:~$ nslookup casa.nostra
Server: 8.8.8.8
Address: 8.8.8.8#53

** server can't find casa.nostra: NXDOMAIN




orlangio@DELL-E6430:~$ cat /etc/resolv.conf
nameserver 8.8.8.8
nameserver 10.39.1.13
domain settebello.info

orlangio@DELL-E6430:~$ cat /etc/hosts
127.0.0.1 localhost popads.net serve.popads.net syndication.exoclick.com creatives.livejasmin.com
127.0.1.1 DELL-E6430
192.185.16.121    test123.settebello.info www.settebello.site
79.143.181.37     fabb.settebello.info

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

orlangio@DELL-E6430:~$ 



ULTIMA PROVA VERIFICO CHE IL SERVER DNS 10.39.* E' NEL NETWORK DI LAVORO E NON E' RAGGIUNGIBILE DA CASA

orlangio@DELL-E6430:~$ nslookup
> server 10.39.1.13
Default server: 10.39.1.13
Address: 10.39.1.13#53
> casa.mia
;; connection timed out; no servers could be reached
> 


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