配置DNS动态解析出错，各位大虾帮我see一下吧！

小弟初学freebsd，在配置DNS动态解析内部局域网时遇到点问题，在这里想请教一下各位。在线等......

实验环境：freebsd 5.1+bind 8
vr0:192.168.1.20/24 (做DHCP，连内网)
dc0:172.16.0.11/16
已经用dnskeygen生成了密钥文件

测试内容：架DHCP+DNS，用DHCP对内部局域网的PC（windows系统）分配指定的IP地址段。配置DNS能动态的解析这些局域网中被分配到IP的主机。

问题：DHCP现能正常的工作，但DNS无法动态的解析，需手动的一条一条记录的加。下面是我机器上的dhcpd.conf和named.conf的配置文件内容。

dhcpd.conf的配置文件如下：
# dhcpd.conf
#
#This is my(James) first DHCP Server!!!

ddns-update-style interim;
server-identifier 172.16.0.11;
default-lease-time 6000;
max-lease-time 72000;
option broadcast-address 192.168.1.255;
option routers 192.168.1.20;
option domain-name-servers 172.16.0.11;
option domain-name "test.com";
option perform-mask-discovery on;
option mask-supplier on;
#ddns-update-style none;

key "dns-update" {
algorithm hmac-md5;
secret "1ohLxoBhYyUMEaDm9MWn7A==";
}

zone test.com.{
primary 172.16.0.11;
key dns-updates;
}

zone 0.168.192.in-addr.arpa.{
primary 172.16.0.11;
key dns-updates;
}

zone 0.16.172.in-addr.arpa.{
primary 172.16.0.11;
key dns-updates;
}

group{
subnet 192.168.1.0 netmask 255.255.255.0{
range dynamic-bootp 192.168.1.50 192.168.1.150;
}
}



Named.conf的配置文件如下：

key "dns-updates" {
algorithm hmac-md5;
secret "1ohLxoBhYyUMEaDm9MWn7A==";
};

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

zone "0.0.127.IN-ADDR.ARPA" {
type master;
file "localhost.rev";
allow-update {none;};
};

zone "1.168.192.IN-ADDR.ARPA" {
type master;
file "/etc/namedb/rev/192.168.1.rev";
allow-update {key dns-updates;};
};

zone "0.16.172.IN-ADDR.ARPA" {
type master;
file "/etc/namedb/rev/172.16.0.rev";
allow-update {none;};
};

zone "test.com" {
type master;
file "/etc/namedb/hosts/test.com.hosts";
allow-update {key dns-updates;};
};