Discussion:
[Bug 219991] [PATCH] TCP process bogus packets with too large ACK
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b***@freebsd.org
2018-11-18 14:56:08 UTC
Permalink
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219991

Michael Tuexen <***@freebsd.org> changed:

What |Removed |Added
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CC| |***@freebsd.org

--- Comment #1 from Michael Tuexen <***@freebsd.org> ---
Can you provide a .pcap file? Whether the reaction from the FreeBSD side is OK
not not depends on SEG.SEQ of the received ACK segments. Unfortunately, tcpdump
doesn't how SEG.SEQ for the ACK segments.

Please note that https://tools.ietf.org/html/rfc793#section-3.9, page 69,
specifies the conditions under which a received TCP segment is acceptable. If
the received ACK is not acceptable (this depends on SEG.SEQ), an ACK as the one
being sent has to be sent.

So seeing the SEG.SEQ of the ACK segments is crucial here.
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