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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