Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

tyntwitch_13422's avatar
tyntwitch_13422
Icon for Nimbostratus rankNimbostratus
Dec 04, 2013

Block request by IP and send an HTTP response

Just getting into iRules and I want to block a specific IP from being able to access a webpage but return an HTTP response back to the browser. I am attempting to do this, but still not quite getting...
application delivery
deployment
devops
irules
uni's avatar
uni
Icon for Altocumulus rankAltocumulus
Dec 04, 2013

The CLIENT_ACCEPTED event is not required. [IP::client_addr] is available in the HTTP_REQUEST event. There is a bracket missing after the 'if' in the HTTP_REQUEST event. You should use the IP::addr command to compare IP addresses

when HTTP_REQUEST {
    if {[IP::addr [IP::client_addr] equals 172.18.33.226]} {
        HTTP::respond 200 content "${static::IPBlock}"
    }
}

Your use of a static variable to hold the response is ok, but I would consider using an iFile, which makes it easier to manage.