Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?




Hierarchy Level


Configure TCP session attributes:

  • Aggressive TCP ACK

  • FIN invalidate session—To Immediately end the session on receipt of fin (FIN) segment.

  • Maximum window—Maximum TCP proxy scaled receive window, default 256K bytes.

  • TCP sequence number checking.

  • TCP SYN bit checking.

  • Reset (RST) checking.

  • Initial TCP session timeout—The minimum value you can configure for TCP session initialization is 4 seconds. The default value is 20 seconds; if required you can set the TCP session initialization value to less than 20 seconds.

  • Strict TCP SYN checking.

  • TCP fast open (FSO) for TCP proxy session.

  • TCP session timeout for time-wait state.

  • TCP selective ack for TCP proxy session.


The remaining statements are explained separately. See CLI Explorer.

Required Privilege Level

security—To view this in the configuration.

security-control—To add this to the configuration.

Release Information

Statement introduced in Junos OS Release 8.5.