F5 Big-IP, X-Forwarded-For and IIS Logs

f5-big-ipiis-7isapiloggingx-forwarded-for

I've got an F5 Big-IP that is mangaged by our hosting provider. It's dedicated to our private VLAN, etc. Works great 🙂

We requested them to add in an X-Forwarded-For HTTP-Header field. They've done that and we can now access that in the code. Awesome 🙂

But .. for our IIS logs, it's still the IP of the F5 machine. I think I was told that we need to apply an ISAPI filter (cringe!) to the IIS server(s).

  1. Can someone confirm this?
  2. If #1 == yes, is there a file/instructions how to do this for our IIS7 web servers on windows 2008 machines.

Best Answer

I published an ISAPI filter to work with our BIG-IP's and have just updated it with full x86 and x64 support. Check out the blog post I wrote on it a while ago. Just copy the enclosed F5XForwardedFor.dll to your server and reference it in the ISAPI section of your virtual site.

http://devcentral.f5.com/weblogs/joe/archive/2005/09/23/1492.aspx

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