Forum Discussion

Nandhi's avatar
Nandhi
Icon for Cirrus rankCirrus
Jan 10, 2024

Add a custom "X-forwarded-for" header name

Hello Everyone, Need an assistant to add custom http header name and value to insert XFF headers. The default name "X-forwarded-for" cannot understand by the client side. Example need to add name "H...
application delivery
security
Nandhi's avatar
Nandhi
Icon for Cirrus rankCirrus
Jan 10, 2024

Thanks Paulius & Zamroni.

The actual need is bit different. The end point expecting the header name "HTTP_XFF" with original client IP. By default, header name uses the string X-forwarded-for:<client-ip>

The end point does not support "X-forwarded-for" and supported configuration is ,<add key="LoadBalancerClientAddressHeader" Value="HTTP_XFF"/>

  • Paulius's avatar
    Paulius
    Icon for MVP rankMVP
    Jan 10, 2024

    Nandhi I'm not sure I am understanding your request. If you are looking to use an different X-Forwarded-For name you can use the field in "XFF Alternative Names" in the HTTP profile rather than using an iRule.

  • zamroni777's avatar
    zamroni777
    Icon for Nacreous rankNacreous
    Jan 10, 2024

    when the http request comes to f5 vs, does it already have xff header?

    if no, then you simply can set the custom header name in http profile as Paulius mentioned above.
    example in picture 1

    but if yes, then you can use gui based traffic policy to copy and create new xff header.
    example in picture 2