单网卡做NAT客户端不能进行域名解析该如何解决？

DoItYourself

模拟环境：

Win2003做客户端，192.168.1.5，255.255.255.0，192.168.1.8，218.108.248.200

FC3（VMware）做ppp0共享，192.168.1.8，255.255.255.0，resolv，218.108.248.200

＃vi /etc/sysctl.conf
net.jpv4.ip_forward=1

＃iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o ppp0 -j MASQUERADE

＃adsl-start

FC3可以正常上网，Win2003可以Ping通公网地址，但不能解析域名

是否在iptables还需要做别的安全设置？该如何解决，谢谢！

iptables的内容如下：

# Generated by iptables-save v1.2.11 on Tue May 3 21:00:43 2005
*nat
REROUTING ACCEPT [15427:3096471]
OSTROUTING ACCEPT [32:2613]
:OUTPUT ACCEPT [32:2613]
-A POSTROUTING -s 192.168.1.0/255.255.255.0 -o ppp0 -j MASQUERADE
COMMIT
# Completed on Tue May 3 21:00:43 2005
# Generated by iptables-save v1.2.11 on Tue May 3 21:00:43 2005
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [2207:241553]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p ipv6-crypt -j ACCEPT
-A RH-Firewall-1-INPUT -p ipv6-auth -j ACCEPT
-A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 21 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Tue May 3 21:00:43 2005
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