Re: [lwip-users] UDP packet sending problem

[patrick Deflandre]

So I give you 4 files for 2 tests.

1 )  The first set is for a tcp connection : tcp_test.pcap , tcp_test.trace.txt.

It is a short connection which is made after a power on of the lwip target. The pc is 133.38.20.50 and the embedded target is 133.38.20.150. We can see the target is responding to the pc arp request.

2)  The second set is for an udp echo test. udp_echo.pcap , udp_echo.trace.txt

It is a short udp request carrying only "ping" data, on which the embeded should simply reply with the same data. We can see the pc arp request, then the udp packet flow from pc to target. But there is after that this Gratuitous arp request from the embedded target to the pc station and no other transmission.

For the two example, I have use a simple net connecting only the pc to the target, but as the pc was previously connect to the lan, there are some garbage requests to the other parts of the lan.

And the xxx.trace.txt contains the application trace output for the communication tests.

Nevertheless, I tried to understand what can happen to the arp request.

Thank a lot for your help.
Patrick.

2009/6/29 Kieran Mansley <address@hidden>

Not sure: I find it really hard to go through text output of packet
captures rather than being able to work through the capture in wireshark
itself.  Could you attach a pcap file instead?

Kieran

tcp_test.trace.txt
Description: Text document

tcp_test.pcap
Description: application/cap

udp_echo.pcap
Description: application/cap

udp_echo.trace.txt
Description: Text document