Thanks for your help, as suggested the combination of IP_HDRINCL and reading
Stevens seems to have me back on the right path. Part of the confusion was
the Linux implementation of IP_HDRINCL appears to need the hardware addresses
writing as well, consequently there are lots of examples of this being done
in order to forge arp replies etc - not what I needed. Or rather, it was
actually.
Anyway, the code is now refusing to send packets entirely, which is actually
good because it implies a checksum is broken somewhere and that's a bug, not
a misunderstanding about the API.
Thanks again,
Dave
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