In some mail from Kris Kennaway, sie said:
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> On Tue, Apr 17, 2001 at 04:36:15AM +1000, Darren Reed wrote:
>
> > You should optimize it for mod being 2^n-1 (or make that a requirement).
>
> I'm afraid I don't have time to look at this right now. Perhaps it
> can be revisited (the sysctl defaults to off for now), or Niels Provos
> may be interested in the idea.
Basically it means '% mod' -> '& mod' and call it with a 2^n-1 number.
> > Also, drop the HTONS statements, they no longer make sense. Before ip_id
> > was a counter and so it made sense (sorta) to change its byte ordering to
> > network. Now it's just a random number so there is no longer any need.
>
> Well, it still has wrapping properties like a network-order counter,
> i.e. the algorithm attempts to order the output so that it doesn't
> wrap within the segment lifetime. That would be lost without using
> HTONS.
You're confusing properties of the local number and some opaque bits in
a packet being sent over the 'net.
Darren
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