[lwip-users] Re: [lwip] Question and thoughts..

[David Ryan]

Jani Monoses wrote:

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>>Hi..
>>
>>I've recently downloaded lwip060rc1 and been working with that.  I 
>>finally got lwip so that I can *nearly* ping it from my pc, however 
>>ethereal is showing up that the ping response ICMP checksum is inccorect 
>>set as 0x335c ( should be 0x6e98 ).  Windows is throwing the response 
>>away as a bad packet.  I haven't started looking closely at the icmp or 
>>ip files yet..  but thought that this sort of error would not show up 
>>just in implementation?  Anyone have similar problem, or suggest how the 
>>environment might effect the outcome of the checksum?  The IP checksum 
>>is coming out correctly.
>>    
>>
>What platform do you run lwip on?
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Just as a follow up..  I've also just tried binding a host on the ps2 
and seeing if I could telnet to it and get an echo back. Looking at 
ethereal again.  The checksum's contained in the TCP portion of the 
packet is being reported as incorrect, while the IP checksum is correct.

I have MEM_ALIGNMENT set to 4.  I assume this is one of the few options 
that could effect checksum calculation?

David.

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