I'm trying to duplicate incoming HTTP requests such that one copy goes to an IIS server that will serve responses back to the client while the other copy goes to another server for further processing and offline research purposes. Both servers are behind a firewall. I know it's possible to generate a duplicate request event once a request has reached IIS, but is it possible to duplicate requests using the firewall that receives requests before they are forwarded to IIS?

Thanks in advance for your help,


  • What kind of firewall is sitting in front of your servers? – EEAA Oct 11 '10 at 16:57
  • Checkpoint firewalls are sitting in front of our servers. – Eric Hendrickson Oct 12 '10 at 16:07

In Linux firewall(iptables):

iptables -t mangle -A PREROUTING -p tcp --dport 80 -j TEE --gateway IP

You may be able to finagle some of this data with a mirrored switch port.

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