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Marvin_129795's avatar
Marvin_129795
Icon for Nimbostratus rankNimbostratus
Sep 04, 2015

Webacceleration profile not caching

Dear All,   I have a Big IP LTM ASM provisioned and applied a web accelerator profile with the default settings (version 11.5.1) to a virtual server. A lot of traffic is passing through but I simp...
application delivery
BIG-IP
LTM
TMOS
web acceleration
Marvin's avatar
Marvin
Icon for Cirrocumulus rankCirrocumulus
Sep 08, 2015

Hi Patrick,

 

I tried your Irule but it did not change anything, there was still nothing being cached. I was testing a bit more to find out what can be causing this strange behavior and you would be amazed on what I found. In the LTM policy that I applied to the virtual server I have some controls activated like ASM, http and l7dos. When I disabled the ASM function in the LTM policy rule that specific content started to be cached in the RamCache immediately.

 

So the doubt I had was correct it is ASM preventing the objects to be cached in RamCache. Just started to look for known issues and found the following article

 

sol14880: BIG-IP ASM may prevent object caching

 

https://support.f5.com/kb/en-us/solutions/public/14000/800/sol14880

 

It just happened to be that I have the policy builder running and ASM is still not in blocking mode. Recommendation When enabling caching on the BIG-IP ASM system, you should apply the Web Acceleration profile or RAM Cache to the BIG-IP ASM-enabled virtual server only after the BIG-IP ASM security policy is stable and in blocking mode.