;; QUESTION SECTION:     ( )
;110.232.187.66.in-addr.arpa.    IN      PTR

;; ANSWER SECTION:       ( )
110.232.187.66.in-addr.arpa. 540 IN      PTR        rhn.redhat.com.

  IP-,    ,  -
      -  dig:

$ dig -x 66.187.232.110

;; QUESTION SECTION:     ( )
;110.232.187.66.in-addr.arpa.    IN      PTR

;; ANSWER SECTION:       ( )
110.232.187.66.in-addr.arpa. 552 IN      PTR        rhn.redhat.com.

     host:

$ host 66.187.232.110

110.232.187.66.in-addr.arpa domain name pointer rhn.redhat.com.
(  )

  DNS

     DNS    -
   DNS.

  DNS

     DNS-,   -
  gethostbynameO.    IP- -
   .  gethostbynameO   hosts 
 /etc/nsswitch.conf (  "nsswitch.conf:    " -
 11),  ,     /    -
    ,   IP-,   .
   DNS-  ,   DNS,
   DNS       
.       .

 

  :

 bind

(

 bind-utils                  '

 caching-nameserver

 system-config-bind (FEDORA)  redhat-config-bind (RHEL) ()

 bind-chroot (    BIND    chroot)

730                            V.     