Forum Discussion

neeeewbie's avatar
neeeewbie
Icon for MVP rankMVP
Dec 24, 2019
Solved

send fin packet when got reset packet

Hi guys !   I have a question! can i configure send fin packet when got reset packet ? is it possible?   thank you!!
application delivery
BIG-IP
  • Surgeon's avatar
    Surgeon
    Dec 24, 2019

    loose close is based on FIN flag. The RST receiver must close the connection. https://tools.ietf.org/html/rfc793

     

Surgeon's avatar
Surgeon
Ret. Employee

It will not make sense. If a remote peer sends RST, it means that the remote peer already closed connection and is not willing to continue talking.

 

FIN means that " I finished talking to you, but I'll still listen to everything you have to say until you say that you're done"

 

On top of that, as per RFC793, the receiver of a RST aborts the connection and goes to the CLOSED state. So, sending FIN in that case will break RFC rules

 

neeeewbie's avatar
neeeewbie
Icon for MVP rankMVP
Dec 24, 2019

aha thank you!

If I don't use the loose close option, do I still have a connection when I receive a reset packet?

  • Surgeon's avatar
    Surgeon
    Ret. Employee
    Dec 24, 2019

    loose close is based on FIN flag. The RST receiver must close the connection. https://tools.ietf.org/html/rfc793

     

  • Surgeon's avatar
    Surgeon
    Ret. Employee
    Dec 24, 2019

    what are you trying to achieve?