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Re: [lwip-users] UDP packet sending problem
From: |
Yoshiki Komatsudaira |
Subject: |
Re: [lwip-users] UDP packet sending problem |
Date: |
Mon, 29 Jun 2009 21:34:20 +0900 |
I don't think the UDP checksum is invalid.
It maybe come from "Checksum offloading".
http://www.wireshark.org/docs/wsug_html_chunked/ChAdvChecksums.html
Subject: Re: [lwip-users] UDP packet sending problem
From: patrick Deflandre
> I am wondering too why my linux station send bad checksum on a few ip
> frame. I don't know if it change something on my problem, but I should
> investigate on that problem too.
>
> Nevertheless, as the udp frame seem to be received by the target, I
> don't think this is the problem for sending an udp frame from the
> embedded lwIP to my linux station.
> Does anybody knows about linux bad checksum of ip frame ?
>
> 2009/6/26 Bill Auerbach <address@hidden>
>
> > Could it be the checksum error?
> >
> >
> >
> > User Datagram Protocol, Src Port: 41486 (41486), Dst Port: tftp (69)
> > Source port: 41486 (41486)
> > Destination port: tftp (69)
> > Length: 13
> > Checksum: 0x3333 [incorrect, should be 0x419b (maybe caused by "UDP
> > checksum offload"?)]
> > [Good Checksum: False]
> > [Bad Checksum: True]
> > Trivial File Transfer Protocol
> > Opcode: Unknown (28777)
> > Data (3 bytes)
RE: [lwip-users] UDP packet sending problem, Bill Auerbach, 2009/06/26