Re: [lwip-users] Re: Checksum calculations

[Sourath Roy]

No, the application doesn't need to change any data after doing the send.
Since the checksum problem shows up when the packet is retransmitted,
gave me an impression that there could be some glitches in the
calculation. But it might not be the case after all, everyone in the
group seems to be quite confident about the algorithm and I would take
that. :) 
What I think could be the problem is with the low_level_output
function. The ethernet chip on the platform is SMSC LAN9115-MT. Is
there a reference port for this chip and I can cross-check our code
against?

Thanks a lot for all the good suggestions! The discussions have been quite useful here ! :) 

- Sourath

On 1/24/08, Kieran Mansley <address@hidden> wrote:

On Thu, 2008-01-24 at 02:06 +0530, Sourath Roy wrote:
> Am I missing something here?

If that is the case your application changing the data after it has told
lwIP to send it is the most likely cause.  Which API are you using?  Can
you give an example of the code you're using to send data?

Thanks

Kieran



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