Mohit Anchlia wrote:
On 6/4/08, Dragon <<mailto:dragon@xxxxxxxxxxxxxxxxxx>dragon@xxxxxxxxxxxxxxxxxx> wrote:André Warnier wrote: Mohit Anchlia wrote: 2. Another question I had was sometimes we don't get real physical IP of the machine but the IP of something that's in between like "router", is there a way to get the real IP so that we don't end up blocking people coming from that "router" or "proxy"In my opinion, you cannot. The whole point of such routers and proxies is to make the requests look like they are coming from the router/proxy, so that is the sender IP address you are seeing at your server level, and that's it. Your server never receives the original requester IP address.---------------- End original message. ---------------------There are legitimate reasons for this to be done as well, indiscriminately blocking such access is a bad idea as it will affect legitimate users. NAT and IP address sharing are among the reasons. This allows an organization to have a router with one public IP address to serve a larger internal network with private IP addresses. Without this, we would have run out of IPv4 addresses a long time ago.DragonIf there is no way to get the real IP address then how would router know which machine to direct the response to. It got to have some information in the packet. For eg: If A send to router B and router sends to C then when C responds how would B know that the response is for A.
---------------- End original message. ---------------------The "real IP" is of no value to an external application because it is a PRIVATE IP address. It is not a unique address and can not be used to uniquely identify a resource.
The router maintains an internal database mapping the connection between the internal machine on the LAN that requested a web page (or other resource) and the server providing it on the Public Internet.
The router public IP is all you are going to get and even if you got the internal IP (which is not a globally unique identifier) it would be pretty much useless to you.
Dragon ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Venimus, Saltavimus, Bibimus (et naribus canium capti sumus) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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