For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

VernonWells's avatar
VernonWells
Icon for Employee rankEmployee
Oct 18, 2015

Yes. Rewrite the HTTP Host header as it is proxied from client-side request to server-side request:

when HTTP_REQUEST {
    if { [getfield [IP::client_addr] . 4] & 0x01 == 1 } {
        HTTP::host "our.url1.com"
    }
    else {
        HTTP::host "our.url2.com"    
    }
}
VernonWells's avatar
VernonWells
Icon for Employee rankEmployee
Oct 18, 2015
I apologize if I missed something you wanted (e.g., @stanislas's pool selection) but I do believe that this accomplishes what you request. I altered the mechanism for octet extraction and odd/even selection in order to make it more compact and slightly faster. More to the point, server virtual host selection is generally a function of the submitted HTTP Host header value. Changing that in HTTP_REQUEST will change it between the BIG-IP and the Pool Member only. Thus, the client will not "know" that a change was made at all (and as such, the originally selected URL will remain unaltered in the user-agent/browser).