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Be careful with some network sniffer, like
ethereal/wireshark: sometimes, if the capture is done from a pc with
checksum offload features, you could see checksums errors which are not real.
How do you do your capture ?
----- Original Message -----
Sent: Wednesday, January 23, 2008 7:26
PM
Subject: [lwip-users] Re: Checksum
calculations
Hello!
I am porting some
network applications from Linux to lwIP stack. So far the progress has been
good, but while some stress tests I often see checksum errors being reported
by the network sniffer. The ethernet chip does not have any checksum
generation support, and so we rely on the software algorithms available inside
lwIP library. Have you guys seen such a problem before? Endianness on the
system is little-endian, but I believe the algorithm already takes care of
that.
Also I don't quite follow the need for check on len being odd and
swapping the acc inside inet_chksum_pseudo (and similar) functions. I think
that's already taken care off in lwip_standard_chksum functions. Any thoughts
on this?
Regards,
Sourath
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