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Pure_Krome_7392's avatar
Pure_Krome_7392
Icon for Nimbostratus rankNimbostratus
Nov 30, 2007

Unable to determine client IP - please help!

Hi Folks,   we're using an F5 BIG-IP to load balance our windows IIS servers. We host our sites at some hosting company. Everything seems to be working fine.     When i check the LOG FILE...
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hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Nov 30, 2007
Hello there,

 

 

If you can't change the default gateway on the IIS servers to the self IP of the BIG-IP, you can configure the BIG-IP to insert the original client IP address in a custom HTTP header named X-Forwarded-For. Joe Pruitt wrote an ISAPI DLL you can install on your IIS servers to log the custom header in the IIS logs. Here are some related posts:

 

 

 

 

SOL4816: Using the X-Forwarded-For HTTP header to preserve the original client IP address for traffic being translated by a SNAT

 

Click here

 

 

IIS ISAPI DLL to log x-forwarded-for

 

Click here

 

 

Aaron