Forum Discussion

Nimbostratus

Mar 05, 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

1 Reply

Leonardo_Souza
Cirrocumulus
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.