Re: Linux 2.2.16 through 2.2.18preX TCP hang bug triggered by rsync
Andi Kleen (firstname.lastname@example.org)
Wed, 24 Jan 2001 21:56:34 +0100
On Wed, Jan 24, 2001 at 11:03:34PM +0300, email@example.com wrote:
> > I read through the tcpdump, and it seems that Linux completely ignores
> > packets with out-of-window sequence numbers:
> Yes, Linux is __very__ not right doing this. RFC requires to accept
> ACK, URG and RST on any segment adjacent to window, even if window
> is zero.
It's mostly for security to make it more difficult to nuke connections
without knowing the sequence number.
Remember RFC is from a very different internet with much less DoS attacks.
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