For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

andy_12_5042's avatar
andy_12_5042
Icon for Nimbostratus rankNimbostratus
Sep 04, 2013

LTM TCP Connection management

I am trying to understand why the F5 always shows 2-3 times more active sessions for a pool member than is actaully in the physical server state table. In addition I am seeing a problem with having L...
application delivery
deployment
management
performance
andy_12_5042's avatar
andy_12_5042
Icon for Nimbostratus rankNimbostratus
Sep 04, 2013

traffic was measured from both the F5 pool member statistics as well as the server side session table.. The server will always reflect the most accurate number of sockets that are in EST or TIME_WAIT state for example.

 

None of the things mentioned in that article apply here. Since I have seen this with Round robin that eliminates it being just with least connnections. This is one of those issues that I would need to get at the internals which I cant do without support. For example with some other vendor devices I can turn on specific types of debugging and observer the decision logic on where a request is sent based on the current configuration which is very helpful in these cases. It would at least provide some logic as to why more traffic is getting sent to same set of servers.

 

  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    Sep 04, 2013
    I doubt very much if we'll get to the root cause of this, particularly with such an old version of code. However (Nitass gave me this idea in response to another post) perhaps it can be overcome using a more 'intelligent' load balancing method. Candidates would be Weighted Least Connections, Dynamic Ratio, Observed or Predictive.