能ping通外网，但打不开网页（新手提问）

znmbb

能ping通外网ip和域名，但打不开网页也上不了qq，系统是debian sarge
用ethereal抓包，显示192.168.100.2（dns)－－》192.168.40.216（我的ip）standard query response , no such name  
最近网关禁了arp广播，只打开了21和23端口，之前是能打开网页的
网卡配置：

### etherconf DEBCONF AREA. DO NOT EDIT THIS AREA OR INSERT TEXT BEFORE IT.
auto lo eth0

iface lo inet loopback

iface eth0 inet static
        address 192.168.40.125
        netmask 255.255.255.0
        broadcast 192.168.40.255
        gateway 192.168.40.1
        name ghh
        network 192.168.40.0


### END OF DEBCONF AREA.  PLACE YOUR EDITS BELOW; THEY WILL BE PRESERVED.

```````````````````````````````````````````````````````````

DNS是192.168.100.2


windowsXP 里面是
192.168.40.125
255.255.255.0
192.168.40.1－网关
192.168.100.2－DNS
winXP 可以正常上网

麻烦老大

jlake

似乎是SNAT的设置问题。