호스트네임이 설정 안된거 같은데요.
/etc/HOSTNAME 에 ns.powerplaza.com
/etc/hosts 에
 127.0.0.1 localhost
 211.197.208.13 ns.powerplaza.com
 /etc/resolv.conf 에
 search powerplaza.com
 nameserver 211.197.208.13
/etc/sysconfig/network 에
 DOMAIN=powerplaza.com
 HOSTNAME=ns.powerplaza.com
이렇게 설정 되어 있나 확인하시고 안돼 있으면 설정하고 함 해보세요.
정확한건지는 잘 모르겠지만 전 이상없이 잘 돌아가고 있거든요.
   : ******** named.conf ***********
: // generated by named-bootconf.pl
:
: options {
:         directory "/var/named";
:         /*
:          * If there is a firewall between you and nameservers you want
:          * to talk to, you might need to uncomment the query-source
:          * directive below.  Previous versions of BIND always asked
:          * questions using port 53, but BIND 8.1 uses an unprivileged
:          * port by default.
:          */
:         // query-source address * port 53;
: };
:
: //
: // a caching only nameserver config
: //
: zone "." IN {
:         type hint;
:         file "named.ca";
: };
:
: zone "localhost" IN {
:         type master;
:         file "localhost.zone";
:         allow-update { none; };
: };
:
: zone "0.0.127.in-addr.arpa" IN {
:         type master;
:         file "named.local";
:         allow-update { none; };
: };
:
: zone "powerplaza.com"{
:         type master;
:         file "powerplaza.com";
:         };
:
: zone "208.197.211.in-addr.arpa" IN {
:         type master;
:         file "208.197.211.zone";
:         allow-update { none; };
: };
:
: ********************** powerplaza.com ************
:
: $TTL 3600
: @ IN SOA ns.powerplaza.com. root.ns.powerplaza.com.(
:         20000504 ; Serial
:         36000 ; Refresh
:         3600 ; Retry
:         3600000 ; Expire
:         36000 ) ; Minimum
:         IN NS ns.powerplaza.com.
:         IN A 211.197.208.13
:         IN MX 1 powerplaza.com.
: ns IN A 211.197.208.13
: www IN A 211.197.208.13
: ftp IN A 211.197.208.13
:
: **************** 208.197.211.zone ***********$TTL 86400
: @ IN SOA ns.powerplaza.com. root.powerplaza.com. {
:         20010410002 ; Serial
:         3600 ; Refresh
:         300 ; Retry
:         1728000 ; Expire
:         43200 ) ; Minimut
:
:
:         IN NS ns.powerplaza.com.
:
:         13 IN PTR ns.powerplaza.com.
:
: ************************************************************
:
: 이상입니다... 나머지는 리눅스 깔때 있던거 그대로 썼습니다...
:
: 머가 문젠지 모르겠습니다
:
: 에러 내용은
: [root@ns /etc]# nslookup www.powerplaza.com : Server:  localhost
: Address: 127.0.0.1
:
: *** localhost can't find www.powerplaza.com: Server failed
:
: 입니다..... 떱 밤 다 새씀니다...
:
: --
: 이 곳에 서명을 적어주십시오.
: 따뜻한 한마디로 리눅스 강국된다.