xff and geolocation

User

If I want to create a dos l7 profile that needs to check the xff header as the source address (I will add an http+xff profile), and I want to exclude a country from the dosL7 policy using an LTM policy - can this be done with XFF? can the ltm policy recognise xff addresses' geolocations?

If not with ltm policy, can this be done with an irule?

Using the X-Forwarded-For (XFF) header to determine the source IP address can be helpful, but the LTM policy itself won't have built-in functionality to directly recognize the geolocation of the IP addresses extracted from the XFF header. However, you can achieve this functionality with iRules.

Here's a general approach using an iRule:

Extract the client IP address from the XFF header.

Use a geolocation lookup service or database (e.g., MaxMind GeoIP) to determine the country associated with the extracted IP address.

Implement logic in the iRule to exclude requests coming from the specified country from the DoS L7 policy.

An iRule allows for more flexible and custom scripting, enabling you to manipulate traffic based on various conditions, including the XFF header and geolocation data. Below is a simplified example of how you might implement this:

tcl

Copy code

when HTTP_REQUEST {

    set xff_header [HTTP::header "X-Forwarded-For"]

    if { $xff_header ne "" } {

        # Extract the client IP address from the XFF header

        set client_ip [lindex [split $xff_header ","] 0]

        # Perform geolocation lookup for the client IP address

        set country [geo::ipcountry $client_ip]

        # Check if the request is coming from the excluded country

        if { $country eq "Excluded_Country_Code" } {

            # Exclude requests from the excluded country

            reject

            return

        }

    }

    # If not from the excluded country, continue processing the request

    # Add other logic or actions here

}

Replace "Excluded_Country_Code" with the appropriate country code for the country you want to exclude from the DoS L7 policy.

Keep in mind that implementing such logic can add complexity to your configuration, and you should thoroughly test and validate the iRule to ensure it behaves as expected and does not inadvertently block legitimate traffic. Additionally, consider the performance impact of using iRules,

 especially if they are processing a large volume of traffic.