Connections not flowing equally to pool with same pool member ip and different port

Question

We have two VIP for HTTP and HTTPS and its configured with single same pool in F5. And the pool members configured with mixed port like same ip configured with 80 and 10200 port. We have observed a unusual behaviour in LB pool that traffic only flowed to member which is configured with 80 port. But the expected flow is it should flow traffic to all members ( both 80 and 10200 port ) as per the loadbalancing method - round robin.

Traffic is equally distributed when i have pool with same port for all members ( 10200 ) and it is not working when we configured member with 80 port in same pool.

Note:

All members configured in same priority group and ratio is 1

petewhite · Answer

Check that the VS has Translate Port enabled.
Presumably both pool members are showing as up

krish90 · Answer

PeteWhite&nbsp;Hi yes I have verified below items and its enabled on both VIP ( HTTP and HTTPS&nbsp; )&nbsp;Port Transaltion&nbsp;Address Translation&nbsp;Yes all members are up and showing like online and attached with pool( total member count is eight ). And 7 members configured with 10200 port and 1 member alone configured with 80 port.&nbsp;&nbsp;

mohamed_salah_ · Answer

Hello,Based on the below answer in this link, the port translation is the only mandatory option to allow traffic on different pool members ports.https://community.f5.com/t5/technical-forum/pool-members-on-different-port-can-be-mapped-to-same-pool/td-p/252918you can check the pool statistics and see whether F5 is sending traffic to this pool member *80* or no traffic is sent at all. Also, try adding the pool member 80 alone and use this pool and check whether it is going to work or not. if it didn't work, check the backend server itself and try to access it directly.&nbsp;&nbsp;

mohamed_salah_ · Answer

Hello,Based on the below answer in this link, the port translation is the only mandatory option to allow traffic on different pool members ports.https://community.f5.com/t5/technical-forum/pool-members-on-different-port-can-be-mapped-to-same-poo...you can check the pool statistics and see whether F5 is sending traffic to this pool member *80* or no traffic is sent at all. Also, try adding the pool member 80 alone and use this pool and check whether it is going to work or not. if it didn't work, check the backend server itself and try to access it directly.

mike757 · Answer

Check that you haven't configured something like OneConnect or Persistence profiles. Those can impact the choice of pool member.

You can also change the configuration of source port from "preserve" (default) to "change". I know it seems unrelated, but I've solved issues similar to yours using this option.

/Mike/

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Connections not flowing equally to pool with same pool member ip and different port

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