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Abed_AL-R_26070's avatar
Abed_AL-R_26070
Icon for Nimbostratus rankNimbostratus
Oct 03, 2017

load balancing behavior

Hi all

 

I have configured two virtual servers , one with source: 0.0.0.0/0 -production- , and the other one -for tests- with my ip address (more specific) .. but still when I surf to my web site I go through the one with the source 0.0.0.0/0

 

Why this is happening ? What should I configure to go through the more specific one ?

 

application delivery
LTM
  • Jad_Tabbara__J1's avatar
    Jad_Tabbara__J1
    Icon for Cirrostratus rankCirrostratus
    Oct 03, 2017

    Hi Ac89,

    Normally based on the precedence order, more specific VS should process the traffic in the following order :

    1 - dest_host, source_host, port

2 - dest_host, source_host, *

3 - dest_host, source_network, port

4 - dest_host, source_network, *

5 - ...  

For more info check https://support.f5.com/csp/article/K14800

    In your case, could you verify that both VSs has same dest_host and same port values ? And you have a public VS with 0.0.0.0/0 as source_host for the second you should have specific IP address x.x.x.x/32

    You can also verify which VS is handling the traffic using a tcpdump. Example: 

    tcpdump -nni 0.0 host "x.x.x.x"

    The ouput will be similar to this : 

     11:23:47.334858 IP vip.443 > x.x.x.x.49391: Flags [P.], seq 23274:25504, ack 3006, win 7385, length 2230 out slot1/tmm0 lis=/Common/**vs-name**
11:23:47.335714 IP x.x.x.x.49391 > vip.443: Flags [.], ack 25504, win 64240, length 0 in slot1/tmm0 lis=/Common/**vs-name**

    Hope it helps