[syslinux] tftp-hpa fails after lost data packet

[John Smith]

Hello,
I am using the tftp-hpa 0.48 as delivered in Linux Fedora Core 9 as a 
client to send a file to another server on an unreliable network.
The transaction is sometimes timing out.

I have monitored the the TFTP packets to see what is missing.

It seems a DATA packet is being lost. The server is repeating the ACKs 
for the previous packet every three seconds. I think these repeated ACKs 
are preventing the receive packet operation in the tftp-hpa client from 
timing out, so that the client never resends the missing DATA
packet. And ultimately the whole transaction fails.

In contrast, if I suddenly turn off the power of the server, then I
do see repeated data packets sent by tftp-hpa, as expected.

Is this a minor bug, or have I mis-understood the TFTP specs?

John

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