Getting IP address of client in Jsp page

Question

I want to fetch Ip address of client in my jsp page and want to store on my Database.

I am using following code in Jsp page to fech Ip address, but it is showing the servers Ip address.

 <input type="hidden" name="ipaddress" value="<%=request.getRemoteAddr()%>"/> 

Answer 1

In usual case the method ServletRequest.getRemoteAddr() (or getRemoteHost() and getRemotePort() ) should returns details of the actual client. But, if its routed through a proxy, or a differnt servlet engine you would be getting ip of those machines. To tackle these situation you could try below operations

request.getHeader("VIA")             --> Gateway   
request.getHeader("X-FORWARDED-FOR")--> IPaddress

But this could return null if the request is directly from the client. You may handle the situation with some additional conditions to get valid data.

Answer 2

Trying to get the client IP address from the server side with the request object is never a reliable method.

The most reliable ones tend to get executed on the client side, with ActiveX, Applets, or Javascript just to name a few. However, this also poses some challenges. Check the answers to this question just so you know what you're up against ( This is my prefered answer from that )