source persistence is failing!

Hi,

 

I'm running simple LB configuration.

 

Two nodes/webservers in pool POOL1

 

Two VIPs: HTTP and HTTPS

 

HTTPS is running SSL offloading.

 

Source IP profile:time-out of 3600seconds, enabled "Match Across Services" plus Map Proxies enabled by default.

 

People that are using the VIP are compiling that "Source IP" persistence if failing!

 

I was able to reproduce it using running from one server ab -n 10000 -c 500 http://"VIP" and ab -n 10000 -c 500 http://"VIP" .

 

During this test persistence jumped from one node to another twice.

 

 

I'm running LTM 9.4.6.

 

Any idea why this is happening?