tftp SAS

[Jack]

The busybox version is 1.15.3, and the following URLs are log images.

The first is about tftpd32 log message from windows.
http://i.imgur.com/dXYTNpW.png

The second is about wireshark log message from windows.
http://i.imgur.com/Tf8KKFy.png

It looks like missing Block 407, and I have some questions:
1. The tftpd32 shows 'ack 408 ignore', but the duplicate ack packets are
block 407 in wireshark. It seems different block from two of them.

2. The SAS declaration is that more than two packets are sending on the
network between source and destination. But in tftp.c code and above
images, The SAS problem seems to be solve.

Thanks.

2015-03-05 19:00 GMT+08:00 Denys Vlasenko <vda.linux at googlemail.com>:

> Which version of busybox do you use?
> Can you show packet log you see?
>
> On Thu, Mar 5, 2015 at 6:57 AM, Jack <jackzzjack at gmail.com> wrote:
> > Hi,
> >
> > I have a question, that is about tftp protocol.
> >
> > When I try to send file from PC to embedded System, using tftp protocol
> and
> > tftp command. It seems like the tftp shows some "Ack block XXX ignored".
> At
> > the same time, I use the wireshark to capture the packet. It shows
> multiple
> > Ack message receiving on PC.
> >
> > Is that normal ? Is this condition called SAS (a.k.a Sorcerer's
> Apprentice
> > Syndrome) ?
> >
> > Thanks.
> >
> > _______________________________________________
> > busybox mailing list
> > busybox at busybox.net
> > http://lists.busybox.net/mailman/listinfo/busybox
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.busybox.net/pipermail/busybox/attachments/20150306/c0dee3ac/attachment-0001.html>