请问：开发板能ping IP，不能ping域名…

请教：开发板能ping IP，不能ping域名……
在开发板上移植3G模块，交叉编译pppd拨号，将pppd和chat传到开发板上，成功连接了网络。

连接网络时分配的IP及DNS：

C/C++ code

local  IP address 172.19.18.45
remote IP address 10.64.64.64
primary   DNS address 210.21.196.6
secondary DNS address 221.5.88.88

在/etc/resolv.conf添加DNS服务器地址

C/C++ code

# cat /etc/resolv.conf
nameserver 210.21.196.6
nameserver 221.5.88.88

ping通百度的IP

C/C++ code

# ping 220.181.112.143   
PING 220.181.112.143 (220.181.112.143): 56 data bytes
64 bytes from 220.181.112.143: seq=0 ttl=46 time=1952.636 ms
64 bytes from 220.181.112.143: seq=1 ttl=46 time=975.464 ms
64 bytes from 220.181.112.143: seq=2 ttl=46 time=256.408 ms
64 bytes from 220.181.112.143: seq=3 ttl=46 time=295.257 ms
^C
--- 220.181.112.143 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 256.408/869.941/1952.636 ms

不能识别百度的域名

C/C++ code

# ping www.baidu.com    
ping: bad address 'www.baidu.com'

C/C++ code

# nslookup www.baidu.com
Server:    210.21.196.6
Address 1: 210.21.196.6

nslookup: can't resolve 'www.baidu.com'
#

能ping通域名服务器。

各位高手请指教指教，谢谢。

------解决方案--------------------
不能根据域名解析出IP，明显应该是dns的问题。

请问：开发板能ping IP，不能ping域名…

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