Hallo, a, Du meintest am 18.08.11:
> I have several squid boxes running. There is one which when i set it
> on the proxy configuration on my client PCs browser then open
> www.whatismyip.com , It not only bring its real NAT IP , but also
> below information too. What makes the site gets these information and
> how can prevent or change this banner?
Then try another server/service, p.e.
myip.it
myip.nl
And then you need a script for extractiing the IP address ...
Viele Gruesse!
Helmut
