Re: [lwip-users] Support required for LwIP:URGENT

[Robin Iddon]

Hi Nitin,

OK, looking at your trace I see a couple of things.

(1) Your MAC address for your LWIP machine is 0d:0a:08:04:02:01 - you 
shouldn't have the least significant bit of your first byte set as this 
makes it a multicast - not sure that matters in this case, but even so 
it would be better to start 0c rather than 0d.
(2)  Packet 1 is the start of a successful transfer of img4.jpg, 
initiated by the PC.  The whole file is transferred (nice shirt, BTW 
;-)) and the sequence completes OK with the LWIP machine initiating 
shutdown with a FIN at packet 24, and the connection being closed at 
packet 26.
(3) This sequence continues with several more successful transfers until 
packet 221.  Here the PC initiates a connection, the LWIP machine 
replies in 16ms but the PC generates a RST.
(4) The next sequence starts OK but the PC generates a RST midway 
through the session, again when the LWIP machine takes ~50ms to generate 
the next packet.

Whatever is going wrong, it isn't the fault of LWIP - a 50ms response is 
entirely reasonable behaviour mid-TCP stream.

What are you using as an http client (your own program, internet 
explorer, wget, ...)? 

Does the same problem happen with both web browsers and wget, etc? 

Can you try running from a different PC?  There are some registry values 
that control TCP behaviour on Microsoft PCs - I don't know whether there 
is an option that if set to a very low value might cause this, but an 
easy way to find out would be to use a different machine and see if the 
problem goes away!

Let us know how you get on.

cheers,
Robin

Nitin AGARWAL wrote:
> Pls find attached the ethereal trace which is reflecting that the
> (OS:windows 2000) PC is renerating reset. How can I do that the PC should
> wait longer before generating reset? I am using TCP.
>
> Regards,
> Nitin 
>
> Tina #199-3739
> IMS Systems Lab, Noida
> http://ims.st.com/systemslab/index.php
>
>