We all at some degree wanted to know who is accessing our web page .
Our generator of information is the access log file. sometimes we do not get what we expect to .
In subject if we want to know the exact node ’ randomness IP. sometimes All you get is some network/firewall end point IP savoir-faire which is none of your concern.

so how to get your claim node IP address in your vane server log file .
Before discussing that part. We have to set a stage foremost, an infrastructure setup which we could relate and understand. The aim of this post will only be met if we are on the like page .

Let’s consider a scenario like this. 
  • A user named “Tony Stark” { I like him :)} is launching the URL www.mwinventory.in from his home in his favorite browser.
  • After all the DNS resolution story, It gets the IP of the domain name mwinventory.in as
  • This must be a Public IP address, Generally denoted or pointing to some internal virtual IP  of the company  mwinventory VIP [Virtual IP is an IP created/used in Load Balancer (Bigip, F5, Squid) to receive the global request before applying any load balancing (or) IP spraying (or) internal re-routing strategies.]
  • These VIPs will forward the requests to the actual web server IP address (or) to a group of web server organized and denoted in the name of pool
  • When the HTTP request reaches the Load balancer, it continues the journey through the load balancing rules and find its way to the web server using  server_pool or an Irule [Rules, written for routing, A kind of algorithm]
  • After reaching the web server based on the technology this site is using it will either go to the application server (or) will be processed at the web server itself. i.e LAMP/WAMP [PHP/CGI] websites
  • In case of java based web application, HTTP request will proceed further to application server with the help of application server proxies/plugins like [mod_proxy/mod_jk/WebLogic Proxy Plugin/Websphere Proxy Plugin]

In this long voyage, Tony Stark ’ s actual IP address would get lost or gets replaced by the IP cover of any edge components like load balancer ( or ) firewall

therefore last, on the world wide web server what we get is not the IP address of Tony Stark. ( not even Hulk 🙂 ) it is some edge component ’ mho IP. We do not need that .

sol how to handle it ?

here comes the header, which is going to help us on this mysterious travel of HTTP request

What is X-Forwarded-For

The X-Forwarded-For ( XFF ) HTTP header field is a common method for identifying the originating IP address of a node connecting to a web waiter through an HTTP proxy or load balancer .
therefore let us start with, how to enable X-Forwarding in the Load Balancer
I am taking Big-IP Load balancer for this article .

How to enable XFF in BigIP

To configure the BIG-IP system to insert the original customer IP address in an X-Forwarded-For HTTP header, perform the following operation :

  1. Log in to the Configuration utility.
  2. Navigate to  local traffic >  Profiles.
  3. From the  Services menu, click  hypertext transfer protocol.
  4. Click  create.
  5. Type a name for the HTTP profile.
  6. Select the  Insert X-Forwarded-For check box.
    note : Older versions of BIG-IP software may display the choice as Insert XForwarded For rather of Insert X-Forwarded-For .
  7. From the  Insert X-Forwarded-Formenu, select  Enabled.
  8. Click  Finished.
    You must now associate the new HTTP visibility with the virtual server/VIP

Using an iRule to insert the original client IP address in an X-Forwarded-For HTTP header

  1. Log in to the Configuration utility.
  2. Navigate to  local traffic >  iRules >  produce.
  3. In the  diagnose box, type a name.
  4. In the  definition box, copy and paste the following iRule:
    when HTTP_REQUEST {
    HTTP : :header slip in X-Forwarded-For [ IP : :remote_addr ]
  5. Click  Finished.
    You must immediately associate the new iRule with the virtual server/VIP
Configuring the web server to extract the IP address from the HTTP header

After you have configured the BIG-IP system to insert the original client IP address in an HTTP heading using an X-Forwarded-For HTTP header, you must besides configure the network server to extract the IP address from the HTTP header, and then log the IP address to the network server log charge .

Apache web server

You can configure an Apache network server to extract the IP address from the X-Forwarded-For HTTP heading and log that IP address to the web server log file by adding the appropriate logging directives to the main Apache shape charge ( typically named httpd.conf ) or to the relevant virtual host configuration files .
For exercise :
LogFormat “ % volt % { X-Forwarded-For } i % lambert % u % metric ton \ ” % r\ ” % > mho % barn ” X-Forwarded-For
CustomLog /var/log/apache/www.example.com-xforwarded.log X-Forwarded-For

IIS web server

Unlike Apache Web waiter, to make IIS web waiter to extract the IP address from the X-Forwarded-For HTTP Header and log that IP savoir-faire to the log file, we need to perform list of configuration changes in the site .

For IIS 7

open IIS director by the move command inetmgr  ( or ) using manipulate panel .
To enable XFF logging you must have a Advanced Logging have enabled
In general “ Advanced Logging ” does not come as built in with IIS 7, you must install as an addition
From hera you can download the same hypertext transfer protocol : //www.microsoft.com/en-us/download/confirmation.aspx ? id=7211
You will get a initiation binary with a name AdvancedLogging.msi  double click on the package to install it on the server

After installing the Advanced Logging plugin, close and re-open the iraqi intelligence service coach and pawl on the server lymph node
You will be able to see an Icon named Advanced Logging under the IIS group on the center empanel
Double chink on Advanced Logging Icon

you will get screen like this, you must enable it by clicking “ Enable Advanced Logging ” choice on the right control panel
After enabling the Advanced Logging
Expand the Server Node – > Click on Sites – > Click on your corresponding Site mention
here my web site name is “ WebServices ”, chatter to select it
Double pawl on Advanced Logging Icon available on the center panel .
on the right panel click on “ Edit Logging Fields ” yoke to add a raw log battlefield
You will get screen like below

now click on Add Field   and fill the values as shown in the under Screen snap bean

now hit OK 
From the Actions pane on the right, click Add Log Definition.

Enter “ Client Source IP ” in the Base file name sphere .

Click Select Fields  and select the Logging Field we have added in the previous section “ Client Source IP

Click OK on the Select Logging Fields form, then click Apply in the actions paneling .
Restart the match web site
The advanced log must be viewed rather than the nonpayment log. The advance logarithm is located in %SystemDrive%inetpublogsAdvancedLogs. To view the logs, right-click the Client Source IP log definition and click View Log Files .

For IIS8

In IIS8 this is much simpler to enable XFF and to capture XFF in the log

  1. Select your website and click on it
  2. Click the Logging Icon in the center panel
  3. In the Log File Grouping click on Select Fields
  4. Click on Add Field and add a new Field as shown in the following snap
  5. Click OK and return to previous page and restart the corresponding website

That ’ s it, you will be able to see the XFF information in the current log charge of your web site .

hope this post is helpful. Please gossip and let me know your feedback

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