> > I don't known if we can setup a really high value by default ?
> 
> no idea, sorry.
> 
> > Also, it's seem that another option must be tune,
> >
> > /etc/modprobe.conf:
> >
> > options ip_conntrack hashsize=32768
> >
> >
> > I need to read a little more about it
> 
> Does that mean that everybody can start a DOS attack by simply
> open(faking) 64000 tcp connections?

http://tools.ietf.org/html/rfc4987

So what can we do to prevent that?

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