Re: Client receives TCP packets but does not ACK

Alan Cox (alan@lxorguk.ukuu.org.uk)
Fri, 15 Jun 2001 20:12:48 +0100 (BST)


> TCP is guaranteed delivery at layer 5 -- but that's all -- not a "guaranteed
> protocol"

For certain specific cases this is in itself not true either. Also for many
many implementations.

Specifically
1. If the receiver closes and there is unread data many TCP's forget
to RST the sender to indicate that data was lost.

2. There is a flaw in the TCP protocol itself that is extremely unlikely
to bite people but can in theory cause wrong data in some unusual
circumstances that Ian Heavans found and has yet to be fixed by
the keepers of the protocol.

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