RE: [lwip-users] low level output question

[John Kennedy]

Yes, I'm sending a ping from my PC to my embedded system running lwip.  With no 
breakpoints set wireshark shows an ARP request going out and the ARP response 
returning from lwip.  Then the PC sends an ICMP (ping request) to the embedded 
system.  So the ARP response packet generated by lwip is correct.  I was just 
puzzled because when I set the breakpoint the pbuf length is 1518?


 
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John Kennedy


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-----Original Message-----
From: address@hidden [mailto:address@hidden
Sent: Friday, May 08, 2009 1:44 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] low level output question

John Kennedy wrote:
> So my quandary is this, I have a breakpoint set in low_level_output.  When I 
> send a ping I hit the breakpoint and the pbuf lwip is trying to send is an 
> ARP response packet, the pbuf has len == tot_len = 1518 although the ARP 
> response packet is actually only 60 bytes?

Just to see if I understood that right: you are sending a ping from the
PC to lwIP? This of course results in an ARP request and lwIP sends an
ARP response which is 1518 bytes long? That would of course be wrong.
Can you check the contents of the packet? I.e. is it really an ARP
request? If that's the case, the most obvious reason is a threading
problem, I guess. It could be anything, though :-(

Simon


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