X forwarder



Keywords: load balancer, load balancing, application delivery, application delivery controller, adc
Description: By default, layer 7 services are non-transparent. This means that the actual client source IP address is replaced by the load balancers IP address, and therefore this address will be recorded in the

By default, layer 7 services are non-transparent. This means that the actual client source IP address is replaced by the load balancers IP address, and therefore this address will be recorded in the IIS logs. One way around this is to insert X-Forwarded-For headers on the load balancer to track the actual client source IP address. IIS can then be reconfigured to make this data available in the logs. The steps required depend on the version of IIS:

In IIS 8.5 and later there is a new feature called “Enhanced Logging”. For more information please refer to this Microsoft link

For IIS 7 & 7.5 the Advanced Logging add-on must be installed. This can be downloaded here. Once installed on the IIS server, you’ll see an extra option called ‘Advanced Logging’ for the sites in IIS.

2. On the Connections pane, click the appropriate server, web site, or directory on which you are configuring Advanced Logging. The Home page appears in the main panel

5. From the Edit Logging Fields dialog box, click the Add Field button, and then complete the following:

6. In the central Advanced Logging pane, select %COMPUTERNAME%-server, and then complete the following:

The advanced log must be viewed rather than the default log. By default this is located in c:inetpublogsAdvancedLogs

Unfortunately, the Microsoft solution mentioned above is not available for IIS 6. luckily there are a number of solutions available to address this limitation – some that cost money and others that have been released as open source. One excellent example that we’ve tested with our products is F5’s X-Forwarded-For ISAPI filter. It’s avaialable in both in 32 & 64 bit versions.

7. Click ‘add’, then in the popup enter a suitable name and select the DLL file stored in step 3

That’s it – you should now start seeing the IP address of the client PC’s in your IIS logs rather than the IP of the load balancer.




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