Re: [lwip-users] UDP send ok but Can't find in Ethereal

[the_gadfly]

Thank you Simon
Unfortunately,the board's ARPs are not answered by PC.Even the PC asked who
is 10.1.1.52 ( pc itself 's ip address).It made me confused…….And i noticed
that sometimes pc answered the board ,however ,the board still didn't send
the Udp messages.
I will come to think of it
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
> -- 
> Neu: GMX Doppel-FLAT mit Internet-Flatrate + Telefon-Flatrate
> für nur 19,99 Euro/mtl.!* http://portal.gmx.net/de/go/dsl02
> 
> 
> _______________________________________________
> lwip-users mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/lwip-users
> 
> 

-- 
View this message in context: 
http://www.nabble.com/UDP-send-ok-but-Can%27t-find-in-Ethereal-tp24263401p24271064.html
Sent from the lwip-users mailing list archive at Nabble.com.