How to Get Client IP Address(s)

Question

We have an asp.net application which deployed in head office of a bank. Employee of bank are consumer of this application.

Employee of Bank are usually access this application using their computers which is connected to internet though a proxy server.

For Auditing purpose we need all(atleat one) ip-address assigned to their LAN-interface, when they login to the application.

I know there are some Server Variables which provides ip of client but they are only giving us ip of Proxy Server(external IP).

Please help of this. Thanks

Answer 1

It depends on the proxy but I believe the standard is to put the original client IP under the server variable called HTTP_X_FORWARD_FOR. Sometimes others are used HTTP_X_FORWARDED and HTTP_CLIENT_IP.