ADSL prob!

[Mc Shch]

   Hi sir:
     I need your help.
     I am using FreeBSD5.3 operating system,and I have configure
   etc/ppp/ppp.conf rightly.
   when I use ppp by typing this:

   #ppp -ddial papchap

   to connect to the internet with a ADSL modem.
   I recive this infomation:

   Working in ddial mode
   Using interface:tun0

   and i try to ping [1]www.baidu.com
   #ping [2]www.baidu.com
   ping:cannot resolve [3]www.baidu.com:Host name lookup failure

   and my webbrowser didnt work...
   I wonder how can i connect to internet and how to configure the
   system!!!
     _________________________________________________________________

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References

   1. http://www.baidu.com/
   2. http://www.baidu.com/
   3. http://www.baidu.com/
   4. http://g.msn.com/8HMBCNCN/2749??PS=47575