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[lwip-users] that's ok ,could someone show me a good rap-api udp receiv
From: |
the_gadfly |
Subject: |
[lwip-users] that's ok ,could someone show me a good rap-api udp receiving software ? |
Date: |
Tue, 30 Jun 2009 19:24:33 -0700 (PDT) |
That's ok , the code sent udp messages successfully when I turning on the
ARP_QUEUEING .According the Ethereal ,the message is correct including src
,dest.and checksum.
However ,my udp receiving software did not work well.so could some one help
me ?
Best Regards
the_gadfly
Simon Goldschmidt wrote:
>
>
>> hi:
>> this is my code,modified form stand-alone lwip example web server. I am
>> trying to send messages through UDP. But all it is sending are ARP's.
>
> That's perfectly OK: before the stack can actually send the UDP packet, it
> has to know the target MAC address. Since it doesn't know it, yet, ARP
> request packets are sent.
>
> The stack should receive ARP response packets and (if ARP queueing is
> turned on), the original UDP packets should be sent (if ARP queueing is
> turned off, the old packets are not sent - udp_send() returns an error -
> but the next packets can be sent).
>
> So the question is: are there any ARP responses and if so, why doesn't the
> stack handle them. You should see the ARP response packets if they come
> from the same PC you are running wireshark on.
>
> Simon
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