A10 X-forwarded-for May 2026

In the CLI:

X-Forwarded-For: <client>, <proxy1>, <proxy2> a10 x-forwarded-for

A malicious client sends an HTTP request directly to your A10 with a forged header: GET /admin HTTP/1.1 X-Forwarded-For: 127.0.0.1 X-Forwarded-For on A10 Networks devices is a powerful

If your A10 is configured to append the client IP (the default), the header becomes: X-Forwarded-For: 127.0.0.1, 203.0.113.5 In the CLI: X-Forwarded-For: &lt

Unlike XFF, which is HTTP-specific, PROXY Protocol prepends a binary header at the transport layer. It preserves the original client IP for any protocol—HTTP, HTTPS, SMTP, or raw TCP. If your backend server supports PROXY Protocol (e.g., HAProxy, Nginx, Apache 2.4.30+), this is a more robust solution than XFF. X-Forwarded-For on A10 Networks devices is a powerful but subtle tool. When configured correctly—preferably with replace mode to block spoofing—it restores end-to-end visibility. However, it shifts responsibility to the backend developer to parse headers securely.