Имеется 2 системы (cat /etc/issue):
1) SUSE Linux Enterprise Server 10 SP1 (i586)
2) SUSE LINUX 10.1 (i586)
Ели на первой системе выполнить dig . ns @localhost
то получим вывод (см. ниже)
Вопрос: Почему во втором случае отсутствует секция ADDITIONAL SECTION ???proxy:/# dig . ns @localhost
; <<>> DiG 9.3.4 <<>> . ns @localhost
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44403
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 11
;; QUESTION SECTION:
;. IN NS
;; ANSWER SECTION:
. 479815 IN NS a.root-servers.net.
. 479815 IN NS b.root-servers.net.
. 479815 IN NS c.root-servers.net.
. 479815 IN NS d.root-servers.net.
. 479815 IN NS e.root-servers.net.
. 479815 IN NS f.root-servers.net.
. 479815 IN NS g.root-servers.net.
. 479815 IN NS h.root-servers.net.
. 479815 IN NS i.root-servers.net.
. 479815 IN NS j.root-servers.net.
. 479815 IN NS k.root-servers.net.
. 479815 IN NS l.root-servers.net.
. 479815 IN NS m.root-servers.net.
;; ADDITIONAL SECTION:
a.root-servers.net. 566217 IN A 198.41.0.4
d.root-servers.net. 574632 IN A 128.8.10.90
e.root-servers.net. 574632 IN A 192.203.230.10
g.root-servers.net. 574632 IN A 192.112.36.4
h.root-servers.net. 574632 IN A 128.63.2.53
h.root-servers.net. 574632 IN AAAA 2001:500:1::803f:235
j.root-servers.net. 573007 IN A 192.58.128.30
k.root-servers.net. 574848 IN A 193.0.14.129
l.root-servers.net. 574632 IN A 199.7.83.42
l.root-servers.net. 574632 IN AAAA 2001:500:3::42
m.root-servers.net. 578459 IN A 202.12.27.33
;; Query time: 8 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Mar 16 17:30:46 2011
;; MSG SIZE rcvd: 428
Второй сервер:
mail:/# dig . ns @localhost
; <<>> DiG 9.3.2 <<>> . ns @localhost
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56562
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;. IN NS
;; ANSWER SECTION:
. 56755 IN NS k.root-servers.net.
. 56755 IN NS l.root-servers.net.
. 56755 IN NS m.root-servers.net.
. 56755 IN NS a.root-servers.net.
. 56755 IN NS b.root-servers.net.
. 56755 IN NS c.root-servers.net.
. 56755 IN NS d.root-servers.net.
. 56755 IN NS e.root-servers.net.
. 56755 IN NS f.root-servers.net.
. 56755 IN NS g.root-servers.net.
. 56755 IN NS h.root-servers.net.
. 56755 IN NS i.root-servers.net.
. 56755 IN NS j.root-servers.net.
;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Mar 16 17:36:34 2011
;; MSG SIZE rcvd: 228