DNS不能解析

我的DNS架好之后在nslookup中不能解析,但是可以PING通.以下是配置文件:

/var/named/dns.arpa
$TTL 86400
@ IN SOA dns.com. admin.dns.com. (
   77191
   604800
   86400
          2419200
   604800 )
@ IN NS dns.com.
117 IN PTR mail.dns.com.
117 IN PTR www.dns.com.
117 IN PTR ns.dns.com.

/var/named/dns.zone
$TTL 86400
$ORIGIN dns.com.
@ IN SOA ns.dns.com. admin.dns.com. (
   511   
    1H
   15M
   1W
   1D )
IN NS ns.dns.com.
ns IN A 192.168.2.117
www IN A 192.168.2.117
mail IN A 192.168.2.117
dns.com IN MX 10 mail.dns.com.


/etc/named.conf
zone "dns.com" IN {
type master;
file "dns.zone";
};
zone "2.168.192.in-addr.arpa" IN {
type master;
file "dns.arpa";
};

已经解决了.....
原因是没有将/var/named/ 下的两个区域文件,链接到/var/named/chroot/var/named下.