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

Forum Discussion

SSHSSH_97332's avatar
SSHSSH_97332
Icon for Nimbostratus rankNimbostratus
Nov 17, 2012

ASM DDOS Protection

How will ASM block attackers only , while not blocing normal users ? or under DDOS limits to drop traffic will be applied to all ( attackers and valid users ) ? https://devcentral.f5.com/community...
app sec
BIG-IP Access Policy Manager (APM)
security
Govindraj_11724's avatar
Govindraj_11724
Icon for Nimbostratus rankNimbostratus
May 08, 2013

Hi All,

 

I have a question on the below info.

 

Per URL:

 

In this case my understanding is that once the total latency or TPS threshold is crossed for a single URL that the ASM will throttle requests to the historical average. I do not believe there is delineation between attacking IP addresses and legitimate traffic, as the it is just looking at traffic rates to a single URL on your site and trying to keep those in check. This way some legitimate traffic should get through but most likely some will get stopped.

 

 

We are testing some F5 ASM URL based throtteling rules on F5 to protect our backend servers.

 

Every time when F5 detects the DoS attack, it starts allowing approx. 3-5 TPS traffic to backend servers. So I am not understanding on basis it is arriving to that figure.

 

Also please provide me the following info,

 

Where can I check the Historical average parameter in F5 server......? and

 

Is there any way to modify/clear the same ...? If yes, how......!!!

 

 

Regards

 

Govindraj B H