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Date:      Mon, 20 Mar 2017 16:54:33 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-net@FreeBSD.org
Subject:   [Bug 217637] One TCP connection accepted TWO times
Message-ID:  <bug-217637-2472-B1L74Ss1BZ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-217637-2472@https.bugs.freebsd.org/bugzilla/>
References:  <bug-217637-2472@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217637

--- Comment #65 from slw@zxy.spb.ru ---
(In reply to Michael Tuexen from comment #64)

> No. The server sends a RST and move the connection to CLOSED. The connect=
ion is
> terminated immediately from the server perspective.

This is wrong behaviour. This is cause lost of server data.

> No. This is an ungraceful termination. No need to wait for anything. All =
peers
> should handle the RST.

No.

pwrite();
close();

This is graceful termination.

> No. Incoming user data is lost on the server side. I think the server sho=
uld
notify
> the peer as soon as possible. Please note that the RST is only sent if the
server
> has to drop user data. If that is not the case, a graceful shutdown will =
be
performed.

User data is second question for server. Main question is resend server res=
pond
to client. This is RFC requiriment. And this is more impotant for user -- s=
ee
respond from server, not just droped connection.

Server can send RST after client ACK server respose and server FIN.

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