On Wed, 02 Feb 2005 18:38:37 +0100
Lorenzo Hern�ndez Garc�a-Hierro <[EMAIL PROTECTED]> wrote:
> El mi�, 02-02-2005 a las 17:17 +0000, [EMAIL PROTECTED] escribi�:
> > There *are* things in OpenBSD, like randomized port assignment (as opposed
> > to the linear scan in tcp_v4_get_port()) that would be worth emulating.
> > Maybe worry about that first?
> >
Recent 2.6 does a more advanced form of port randomization already
using address hash at connect time. tcp_v4_get_port is only used for the case
of applications that explicitly bind to port zero to find a free port.
So the sequence:
socket(); connect();
will assign a random port in a manner similar to sequence number creation
The sequence:
socket(); bind(); connect();
assigns a simple linear increasing port value. It could be randomized, but
most applications don't bother binding, so the first case is sufficient.
--
Stephen Hemminger <[EMAIL PROTECTED]>
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