Originariamente inviato da l.golinelli
dig @ip_server_dns www.ibm.com

Il firewall deve far passare la porta 53 su UDP per le risoluzioni DNS
entrambi funzionano bene
codice:
evilangel@linux:~> dig @212.216.112.112 www.ibm.com

; <<>> DiG 9.2.3 <<>> @212.216.112.112 www.ibm.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32464
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;www.ibm.com.                   IN      A

;; ANSWER SECTION:
www.ibm.com.            1800    IN      A       129.42.17.99
www.ibm.com.            1800    IN      A       129.42.18.99
www.ibm.com.            1800    IN      A       129.42.19.99
www.ibm.com.            1800    IN      A       129.42.20.99
www.ibm.com.            1800    IN      A       129.42.21.99
www.ibm.com.            1800    IN      A       129.42.16.99

;; AUTHORITY SECTION:
ibm.com.                224     IN      NS      ns.austin.ibm.com.
ibm.com.                224     IN      NS      ns.watson.ibm.com.
ibm.com.                224     IN      NS      ns.almaden.ibm.com.
ibm.com.                224     IN      NS      internet-server.zurich.ibm.com.

;; ADDITIONAL SECTION:
ns.austin.ibm.com.      47525   IN      A       192.35.232.34
ns.watson.ibm.com.      15202   IN      A       129.34.20.80
ns.almaden.ibm.com.     68352   IN      A       198.4.83.35
internet-server.zurich.ibm.com. 26384 IN A      195.176.20.204

;; Query time: 439 msec
;; SERVER: 212.216.112.112#53(212.216.112.112)
;; WHEN: Mon Sep 20 20:00:45 2004
;; MSG SIZE  rcvd: 310

evilangel@linux:~> dig @212.216.172.62 www.ibm.com

; <<>> DiG 9.2.3 <<>> @212.216.172.62 www.ibm.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65415
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;www.ibm.com.                   IN      A

;; ANSWER SECTION:
www.ibm.com.            935     IN      A       129.42.21.99
www.ibm.com.            935     IN      A       129.42.16.99
www.ibm.com.            935     IN      A       129.42.17.99
www.ibm.com.            935     IN      A       129.42.18.99
www.ibm.com.            935     IN      A       129.42.19.99
www.ibm.com.            935     IN      A       129.42.20.99

;; AUTHORITY SECTION:
ibm.com.                529     IN      NS      internet-server.zurich.ibm.com.
ibm.com.                529     IN      NS      ns.austin.ibm.com.
ibm.com.                529     IN      NS      ns.watson.ibm.com.
ibm.com.                529     IN      NS      ns.almaden.ibm.com.

;; ADDITIONAL SECTION:
internet-server.zurich.ibm.com. 16469 IN A      195.176.20.204
ns.austin.ibm.com.      68260   IN      A       192.35.232.34
ns.watson.ibm.com.      159578  IN      A       129.34.20.80
ns.almaden.ibm.com.     68260   IN      A       198.4.83.35

;; Query time: 150 msec
;; SERVER: 212.216.172.62#53(212.216.172.62)
;; WHEN: Mon Sep 20 20:01:12 2004
;; MSG SIZE  rcvd: 299

evilangel@linux:~>