[lkml]   [2005]   [Jan]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] OpenBSD Networking-related randomization port
On Fri, Jan 28, 2005 at 06:47:55PM +0100, Lorenzo Hernández García-Hierro wrote:
> El vie, 28-01-2005 a las 18:40 +0100, Adrian Bunk escribió:
> > On Fri, Jan 28, 2005 at 06:17:17PM +0100, Lorenzo Hernández García-Hierro wrote:
> > >...
> > > As it's impact is minimal (in performance and development/maintenance
> > > terms), I recommend to merge it, as it gives a basic prevention for the
> > > so-called system fingerprinting (which is used most by "kids" to know
> > > how old and insecure could be a target system, many time used as the
> > > first, even only-one, data to decide if attack or not the target host)
> > > among other things.
> > >...
> >
> > "basic prevention"?
> > I hardly see how this patch makes OS fingerprinting by e.g. Nmap
> > impossible.
> That's an example, as you can find at the grsecurity handbook [1]:
> "Randomized IP IDs hinders OS fingerprinting and will keep your machine
> from being a bounce for an untraceable portscan."

The OS detection in Nmap [1], which is AFAIK the most popular port
scanner today works by e.g. checking the answer of an ACK to a closed

I do still not understand how your patch has any impact on these issues.

> Cheers,




"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:09    [W:0.069 / U:6.636 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site