    redhat. corn    -
.    NS  redhat. corn DNS    NS. 
,    ,  IP-  ,  
  NS:

$ dig -t NS redhat.corn

;; QUESTION SECTION:          ( )
;redhat.corn.                  IN        NS

;; ANSWER SECTION:            ( )
redhat.corn.           600     IN        NS          ns3.redhat.com.
redhat.corn.           600     IN        NS          nsl.redhat.com.
redhat.corn.           600     IN        NS          ns2.redhat.com.

;; ADDITIONAL SECTION:        ( )
nsl.redhat.com.       300     IN        A           66.187.233.210
ns2.redhat.com.       600     IN        A      .    66.187.224.210
ns3.redhat.com.       600     IN        A           66.187.229.10

   ,         -
   :

sitel.example.com             IN        NS          ns.sitel.example.com
ns.sitel.example.com          IN        A           1.2.3.4

TSIG ( )

   DNS    -: 
      .   ,  
,   ,  ,   IP- .     -
 ,   IP (. ),      
.   BIND    (transaction
signatures  TSIG),       
   .

TSIG         -
  .         , 
  (  ),     
      IP-    
 DNS   .   TSIG    -
  ,    DNS   .

  

        512 . 
      dnssec-keygen,    BIND.
   512-     -
 - MD5 (. ):

742                            V.     