Suddently can't browse internet... "You are not connected to Internet"

It has been now 2 months that I have an issue with internet with my Macbook Pro.
I am connected to Internet and browsing internet, however suddenly and without any reason Safari/Firefox give me a message you are not connected to internet. However, MSN or YM are still working fine
It happened to me with both Airport and Ethernet connection but only with my specific provider (but only in my macbook pro, not in my pc or iphone)
When the problem occurs, I run a network diagnostic and found the following
- Pinging an address that need DNS won't work (ping www.facebook.com ==> error: host unknown)
- DNS lookup however working: lookup www.facebook.com ==> 66.220.145.10
- Pinging 66.220.145.10 is working
- any traceroute on IP numeric address is working, however when it need DNS it is not working (traceroute www.facebook.com: unknown host)
The workaround I found is to disable and enable again the interface to make it working...
Did someone have experience the issue?
Regards, Bernard

Me too.  What a pain!

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