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Date:      Sat, 3 Feb 2018 19:17:47 +0530
From:      Brahmanand Reddy <brahma.gdb@gmail.com>
To:        FreeBSD-security@freebsd.org, freebsd-security-owner@freebsd.org
Subject:   'Syncookies' feature effects to generate new ISN/random with RST happens 15 seconds delay.
Message-ID:  <CAKsRH7kZ8eQKLDv9_YO31LfitpZV12fiJruvt=EyXXk_7fvgdQ@mail.gmail.com>
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Dear Experts,

  Recently i observed in 11.0 FreeBsd Kernel. new ISN random generating
every 15 seconds. RST not happens quickly.

  if disable net.inet.tcp.syncookies=0  on syscntrl.conf .. RST happens
quickly and generate new ISN numnber for next SYN requests.

https://github.com/freebsd/freebsd/blob/master/sys/netinet/tcp_syncache.c#L1882

Could you please confirm its expected behavior about delay.  have notified
this issue, we have any patch please share.

Thanks in Advance,
Brahma
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