IP Address reporting local not internet address

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I have noticed that the IP address that is logged for some of the users of my forum are sometimes reporting as their local IP address when behind a NAT firewall. Is this the function that interrogates the IP address of the PC when posting a message?. This is from functions_common.asp 

--------------------------------------------%>----------------------------------------------
'******************************************
'***  Get users IP address  ***
'******************************************
Private Function getIP()
 Dim strIPAddr
 'If they are not going through a proxy get the IP address
 If Request.ServerVariables("HTTP_X_FORWARDED_FOR") = "" OR InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), "unknown") > 0 Then
  strIPAddr = Request.ServerVariables("REMOTE_ADDR")
 'If they are going through multiple proxy servers only get the fisrt IP address in the list (,)
 ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",") > 0 Then
  strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",")-1)
 'If they are going through multiple proxy servers only get the fisrt IP address in the list (;)
 ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";") > 0 Then
  strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";")-1)
 'Get the browsers IP address not the proxy servers IP
 Else
  strIPAddr = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
 End If
 'Remove all tags in IP string
 strIPAddr =  removeAllTags(strIPAddr)
 'Place the IP address back into the returning function
 getIP = Trim(Mid(strIPAddr, 1, 30))
End Function
--------------------------------------------%>----------------------------------------------

In another bit of my code in default.asp I am using:

Request.ServerVariables("REMOTE_ADDR") and it is showing the 'Internet' address rather than the local PC ip address and so is showing what I want. This is required if anyone posts bad information I can look up their ISP and take legal action if required.  I have seen some posts to my forum that are showing local 192.xxx.xxx.xxx addresses. Can someone tell me if this is the correct file I should be editing to fix my problem.

Cheers

Justin

Edited by jckruger - 08 June 2006 at 2:21am