topic Re: Get the correct IP address in Operating System - Microsoft

Get the correct IP address

'chris' — Fri, 10 Jul 2009 12:26:07 GMT

hi

I'm using this code:

<%=Request.ServerVariables("REMOTE_ADDR")%>

in the .asp webpage installed on the WIN2000 webserver to show via browser the internal IP address from the workstations.
Normally works, but the problem is, sometimes it shows proxy IP address instead of the workstation.
Howto solve this problem?

Re: Get the correct IP address

Nader Qaid A. — Fri, 10 Jul 2009 20:51:14 GMT

Request.ServerVariables("REMOTE_ADDR") can't give you any "real address",
since no "real address" is ever sent except in INTRANETs.
An IP address is something used at the network layer, and shouldn't really be used by your application. If your application needs to know the identity of the sending machine, then it should use something like X.509 certificates, which are meant to represent identity (an IP address is not).
further more you can try when you are using proxy:
<%
ipaddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
if ipaddress = "" then
ipaddress = Request.ServerVariables("REMOTE_ADDR")
end if
%>

Hope that it solve your issue and doubt.
Regards

Re: Get the correct IP address

'chris' — Tue, 14 Jul 2009 10:25:06 GMT

thx, I've implemented this code to asp website:

<%
ipaddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
if ipaddress = "" then
ipaddress = Request.ServerVariables("REMOTE_ADDR")
end if
%>

but the output is empty.

Re: Get the correct IP address

Nader Qaid A. — Tue, 14 Jul 2009 14:46:58 GMT

>>>>if ipaddress = "" then

put the ip address of the proxy between ""

regards

Re: Get the correct IP address

'chris' — Tue, 14 Jul 2009 14:55:47 GMT

sorry , but I don't understand.
Can you pls post the whole code?

Re: Get the correct IP address

Nader Qaid A. — Tue, 14 Jul 2009 16:15:04 GMT

<%
ipaddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
if ipaddress = "" then <<< add your proxy ip"" here and try
ipaddress = Request.ServerVariables("REMOTE_ADDR")
end if
%>

example :
<%
ipaddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
if ipaddress = "192.168.11.253"
ipaddress = Request.ServerVariables("REMOTE_ADDR")
end if
%>

plz reply the results of the outcomes