srinivas wrote:
> to continue with the discussion is there is no chance of getting a real ip from
> a clien who is behind the firewall??
>
In many cases, computers behind a firewall (or even just behind a router) do not
even have a "real" IP address for you to get.
One of the reasons this happens is that certain ranges of IP addresses are
reserved for intranets, and can be used by more than one network. As an example,
my internal network at home is 192.168.xxx.xxx, which is also used by lots of
other networks. My outbound packets are modified by a router/firewall to include
a "real" (from the perspective of the Internet) address, but that address is the
firewall itself. The firewall remembers what internal computer the originating
packet came from, so it translates the destination address and forwards it back to
me.
Even if my internal IP address was forwarded to you, it would be ambiguous --
there is more than one computer connected to the Internet with that address, so
you could not tell them apart anyway.
Finally, for many corporations, this "restriction" is a security feature that they
like -- there's no way for you to snoop the structure of their internal network
(based solely on IP addresses), because the only IP addresses you will ever see
are those for the company's firewall(s).
Craig McClanahan
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