Can X real IP be spoofed?

Can X real IP be spoofed?

X-Forwarded-For HTTP header should not be used for any Access Control List (ACL) checks because it can be spoofed by attackers. Use the real IP address for this type of restrictions.

What is X-Forwarded-For IP?

The X-Forwarded-For (XFF) header is a de-facto standard header for identifying the originating IP address of a client connecting to a web server through an HTTP proxy or a load balancer. X-Forwarded-For is also an email-header indicating that an email-message was forwarded from another account.

Can X-Forwarded-For Be Trusted?

Beginning in BIG-IP ASM 10.1. 0, you can instruct the BIG-IP ASM system to trust the X-Forwarded-For header and use the IP address information in the HTTP header instead of the source IP of the packet if the BIG-IP ASM system is deployed behind an internal or other trusted proxy.

What is X-Forwarded-For in nginx?

X-Forwarded-For (XFF) is a special HTTP header field that is used to identify the originating client IP address, regardless of whether connecting through a proxy, load balancer, or other such service.

When to use X-Forwarded-For or X-real IP?

2 Answers 2. X-Forwarded-For header may be used to forward client’s real IP in case of source NAT. But not all application use them. This header is often inserted by load-balancers or reverse-proxies, depending the architecture in place, when the application needs to know the real IP belonging to a client.

What does X Forwarded For mean in http?

A standardized version of this header is the HTTP Forwarded header. X-Forwarded-For is also an email-header indicating that an email-message was forwarded from another account. If a request goes through multiple proxies, the IP addresses of each successive proxy is listed.

Is the client IP set to be X-real-IP?

Since we have Client IP set by CDN to be X-Real-IP, there is no need to do anything else and we should see correct IP in the logs after enabling the module. There are couple other important things though: set_real_ip_from (set addresses allowed to influence client IP change) and real_ip_recursive.

How is X-Forwarded-For used in proxies?

X-Forwarded-For is usually used by proxies to carry original Client IP through intermediary hops. Otherwords each time request goes through proxy, it should add current request IP to the list. More details here. The format should look like this pretty much: