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Norman_Zhang's avatar
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May 31, 2021

X-Forwarded-For Log iRule

Currently I have "Insert X-Forwarded-For" field enabled on a http-custom profile. I would like to capture the field in the F5 log.


* To enable this, I need to disable http-custom profile and use iRule to insert and log X-Forwarded-For?

* For the iRule, would this be sufficient?



HTTP::header insert X-Forwarded-For [IP::remote_addr]

log local0. "X-Forward-IP: [IP::remote_addr]"


1 Reply

  • Hi Norman,

    you don't have to disable the custom HTTP Profile. You can use this iRule to log the XFF header which was set by the HTTP profile.

    when HTTP_REQUEST {
        if { [HTTP::header values "X-Forwarded-For"] ne "" } {
            log local0. "X-Forwarded-For: [HTTP::header X-Forwarded-For]"

    The iRule will read the XFF value which was inserted by the HTTP profile.