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Forum Discussion

theShell0x0_342's avatar
theShell0x0_342
Icon for Nimbostratus rankNimbostratus
Nov 27, 2017

VS in port different from node port

Hello,   I've a Virtual Server listining in a port 9444 and two nodes in port 9444 and 9447 when the node:9447 responde to the request the url port change as well, how to prevent this behavior?  ...
application delivery
BIG-IP
LTM
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Nov 27, 2017

Hi theShell0x0,

you may take a look to the iRule below. It uses the 

HTTP_REQUEST_SEND
event to enumerate the currently selected pool member and if the pool member IP matches a given criteria it will overwrite the requested HOST-header value to reflect the changed port number...

when HTTP_REQUEST_SEND {
    if { [IP::server_addr] eq "1.2.3.4" } then {
        clientside {
            HTTP::host "vs-hostname:9447"
        }
    }
}

Note: Depending on the behaviour of your web application, it may be also required to parse the HTTP reponses (e.g. HTTP-Redirects, Links in HTML-Source) to untranslate the internal HOST-header value to reflect the external HOST-header value again.

Cheers, Kai