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ricky_paulus_gi's avatar
ricky_paulus_gi
Icon for Nimbostratus rankNimbostratus
Mar 06, 2017

TCP RETRANSMISSION IN F5

Hi Everyone,

 

I'm having trouble with TCP RETRANSMISSION in F5. I tried to send packet through F5. I have 3 PC's, each PC send

 

225.000 transactions. I have 675.000 transactions. when I see packet analyzer (Wireshark), There is TCP RETRANSMISSION in both client side and server side.

 

What caused this retransmission ? How to solve TCP RETRANSMISSION in F5 ?

 

application delivery
BIG-IP
LTM

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  • Leonardo_Souza's avatar
    Leonardo_Souza
    Icon for Cirrocumulus rankCirrocumulus
    Mar 06, 2017

    Not sure if this would be anything at the F5 level. A retransmission can occur if the network was busy, if there are interfaces errors, or other many factors.

    I would start checking the interfaces errors and drops, in all devices. In F5 you can run this command:

    tmsh show net interface all-properties

    You can also play with the TCP profiles, there are profiles for LAN and WAN. Also, there some new TCP profiles in v13.