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IP Address reporting local not internet address

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Forum Description: Support forum for Web Wiz Forums application.
URL: https://forums.webwiz.net/forum_posts.asp?TID=20219
Printed Date: 11 April 2026 at 3:02pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com

Topic: IP Address reporting local not internet address

Posted By: jckruger
Subject: IP Address reporting local not internet address
Date Posted: 08 June 2006 at 2:19am

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

Replies:

Posted By: WebWiz-Bruce
Date Posted: 08 June 2006 at 8:27am

That is the function to change how the IP address is returned.

The problem is if you change it to Request.ServerVariables("REMOTE_ADDR") then you are even less likely to get the correct IP address.

The problem is that IP addresses must be got from the browsers header, which can be changed to hide IP addresses, also if proxy servers, etc. are used then you won't get the IP address using the method you mention.

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