Gerhard Butscher wrote:
> Hello,
>
> I am using the linux (SuSE 7.0) tftp server with an embedded
> tftp client (running on an embedded target). I changed that
> client code and caused by that change a considerable amount of
> delay. And the Sorcerer's Apprentice Syndrome appeared:
>
>>From that point where the server has sent a duplicate data
> packet (after the client's ACK timed out), there were always
> duplicate data (and of course ACK) packets until the end
> of the file transfer.
>
> I am not a protocol expert nor a unix programming expert
> but as far as I understand the tftp server code (e.g.
> tftp-hpa-0.21) there is a handling for duplicate ACK packets.
> But (maybe) not exactly the handling proposed by the RFC 1350.
>
It's hard to know if this really is Sorcerer's Apprentice without seeing
a trace of the traffic. There are other pathologies that can cause this.
Besides, you're talking about the "SuSE 7.0 tftp server", which
definitely isn't tftp-hpa-0.21, so I don't know what baseline code
you're talking about.
-hpa
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