Node down and 3-way handshake

Hi everyone,

 

 

I got a problem with the way our big-ip handles a node down.

 

 

First some background, we're running BIG-IP 9.3.1 Build 37.1

 

 

The virtual server is loadbalancing memcached to a single node in a pool. It uses SNAT.

 

 

When the node goes down there's still a 3-way handshake before a reset is sent. I have verified (with setting up a test-vip with a failing realserver) that the actual server is not the one responding with a 3-way handshake.

 

 

Sending a SYN to the realserver will directly respond with a reset. But going through the loadbalancer it results in the 3-way handshake.

 

 

Is there anyway I can send the reset directly without the loadbalancer doing a 3-way handshake?

 

 

Been scouting through manuals and testing setting "Action On Service Down" to reject but it's still a 3-way handshake performed.

 

 

Any help or suggestions is most welcome!

 

 

.pelle