> It appears that the CISCO refuses to forward UDP packets if the
> checksum is not correct. Part of the IPConfig documentation
> states that 'UDP checksum not calculated -- explicitly allowed
> in BOOTP RFC'.
The UDP checksum must be correct. Its just there is a value which
means "unchecksummed". So long as that is set it ought to behave
> I've had a look at writing code to add a checksum to the packet
> being sent ('ic_bootp_send_if' in 'net/ipv4/ipconfig.c') but can't
> get the right combination. :( It's the sort of thing which would
> take a person who knows how it works a couple of minutes.
> (I've spent most of the day on this problem so far.. :( )
I believe you need to add
b->udph.check = 0;
I think the originator of the code misunderstood the rfc intentions
Alan
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