[질문]bind9에서 host문제

안녕하세요! 수고가 많읍니다.
제가 redhat 7.1에서 bind9X버전을 설치하여 DNS SERVER를 만들고 있는데
각각 할당한 ip로는 접속이 되는데 각각의 ip에 부여된 host로는 접속이
않되는데 그 원인과 해결방법을 도무지 알수가 없어 도움을 청합니다.
질문의 내용이 번잡하고 글의 내용이 많아도 양해를 부탁드립니다.
=== 이부분은 bind9x버전이 설치된 여부입니다.====
[root@ /ns]# rpm -qa | grep bind*
bind-9.1.0-10
bindutils-2.10.91.0.2-3
bind-utils-9.1.0-10
ypbind-1.7-6
bindconf-1.4-1
==== 이부분은 콘솔에서 bind9x가 설치되어 구동되는 화면 입니다.====
[root@ns /root]# ps aux | grep named
root 11100 0.0 0.5 2464 744 pts/1 S 1853 000 grep naemd
[root@ns /root]# ps aux | grep named
named 10783 0.0 3.1 13992 3952 ? S 0927 000 named -u
named
named 10785 0.0 3.1 13992 3952 ? S 0927 000 named -u
named
named 10786 0.0 3.1 13992 3952 ? S 0927 000 named -u
named
named 10787 0.0 3.1 13992 3952 ? S 0927 000 named -u
named
named 10788 0.0 3.1 13992 3952 ? S 0927 000 named -u
named
named 10789 0.0 3.1 13992 3952 ? S 0927 000 named -u
named
named 10806 0.0 3.1 14820 4008 ? S 0934 000 named -u
named
named 10808 0.0 3.1 14820 4008 ? S 0934 000 named -u
named
named 10809 0.0 3.1 14820 4008 ? S 0934 000 named -u
named
named 10810 0.0 3.1 14820 4008 ? S 0934 000 named -u
named
named 10811 0.0 3.1 14820 4008 ? S 0934 000 named -u
named
named 10812 0.0 3.1 14820 4008 ? S 0934 000 named -u
named
root 11102 0.0 0.6 2468 760 pts/1 S 1854 000 grep named
==== 이부분은 named가 실행되고 있는지의 여부 입니다.===
[root@ns /root]# /etc/rc.d/init.d/named start
Starting named [ OK ]

=== 이 부분은 x-windows상에서 네트워크 설정부분 입니다.========
network configurator
Name
Hostname ns.xxx.co.kr
Domian xxx.co.kr
Search for hostnames in additional domains
Nameservers 123.456.78.9
123.456.78.10
123.456.78.11
Host
IP Name Nicknames
123.456.78.9 ns.xxx.co.kr. ns
123.456.78.10 www.xxx.co.kr www

Interfaces
Interfaces ip proto atboot active
lo 127.0.0.1 none yes active
eth0 123.456.78.9 none yes active
eth00 123.456.78.10 none yes active
eth01 123.456.78.11 none yes active
eth02 123.456.78.12 none yes active
eth03 123.456.78.13 none yes active
eth04 123.456.78.14 none yes active

Routing
Default Gateway 123.456.78.1
Defaut Gateway Deviceeth0

=== 이부분은 x-windows상의 bind config에서 생성된 설정을
에디터 상에서 본 내용입니다.===

/etc/host.conf
order hosts,bind

/etc/host
# Do not remove the following line, or various programs
# that require network functionality will fail.
123.456.78.9 ns.xxx.co.kr. ns
123.456.78.11 www.xxx.co.kr www

/etc/named.conf
## named.conf - configuration for bind
#
# Generated automatically by bindconf, alchemist et al.

options {
directory "/var/named/";
};

zone "." {
type hint;
file "named.ca";
};

zone "0.0.127.in-addr.arpa" {
type master;
file "0.0.127.in-addr.arpa.zone";
};
zone "123.456.78.in-addr.arpa" {
type master;
file "123.456.78.in-addr.arpa.zone";
};

zone "xxx.co.kr" {
type master;
file "xxx.co.kr.zone";
};

/etc/resolv.conf
search xxx.co.kr
nameserver 123.456.78.9
nameserver 123.456.78.10
nameserver 164.124.101.2

/var/named/123.78.9.in-addr.arpa.zone
$TTL 86400
@ IN SOA @ root.localhost (
2 ; serial
28800 ; refresh
7200 ; retry
604800 ; expire
86400 ; ttk
)

@ IN NS ns.xxx.co.kr.

3 IN PTR ns.xxx.co.kr.
5 IN PTR www.xxx.co.kr.
6 IN PTR mail.xxx.co.kr.
7 IN PTR ftp.xxx.co.kr.

/var/named/xxx.co.kr.zone
$TTL 86400
@ IN SOA @ webmaster.xxx.co.kr (
3 ; serial
28800 ; refresh
7200 ; retry
604800 ; expire
86400 ; ttl
)

@ IN NS ns.xxx.co.kr
ns IN NS ns.xxx.co.kr.

@ IN A 123.456.78.9
www IN A 123.456.78.11
mail IN A 123.456.78.12
ftp IN A 123.456.78.13
=== 이부분은 x-windows상의 bind config에서 설정된 내용입니다.===

Bind Configuration Tool
Master Zone
Name xxx.co.kr
File Name xxx.co.kr.zone
Contact webmaster@xxx.co.kr
Primary Name Server(SOA) @
Serial Number 3
Records
-------------------------------------
xxx.co.kr
Name Servers ns.xxx.co.kr
IP Address(optional) 123.456.78.11
--------------------------------------
ftp123.456.78.14
Host Name ftp
Address 123.456.78.14
--------------------------------------
mail123.456.78.13
Host Name mail
Address 123.456.78.13
--------------------------------------

www123.456.78.12
Host Name www
Address 123.456.78.12
------------------------------------------
ns served by ns.xxx.co.kr.
Host or Domain ns
Served by ns.xxx.co.kr.
--------------------------------------
123.456.78.in-addr.arpa
IP Address 123.456.78
Reverse IP Address 123.456.78.in-addr.arpa
File Name 123.456.78.in-addr.arpa.zone
Primary Name Server(SOA) @
Name Servers
ns.xxx.co.kr.
Revers Address Table
123.456.78.9 ns.xxx.co.kr.
123.456.78.11 www.xxx.co.kr.
123.456.78.12 mail.xxx.co.kr.
123.456.78.13 ftp.xxx.co.kr.
------------------------------------------------------
위와 같이 DNS가 설정되어 있는데 왜 설정된 각각의 IP로는 접속이되고
HOST에서는 ns.dasanenc.co.kr과 ns2.dasanenc.co.kr은 접속이되는데
www.xxxx.co.kr
mail.xxx.co.kr
ftp.xxx.co.kr로는 접속이 않될까요?
아시는 분계시면 도움을 부탁드립니다.