On Fri, Jan 28, 2005 at 06:47:55PM +0100, Lorenzo Hern�ndez Garc�a-Hierro wrote: > El vie, 28-01-2005 a las 18:40 +0100, Adrian Bunk escribi�: > > On Fri, Jan 28, 2005 at 06:17:17PM +0100, Lorenzo Hern�ndez Garc�a-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 port. I do still not understand how your patch has any impact on these issues. > Cheers, >... cu Adrian [1] http://www.insecure.org/nmap/nmap-fingerprinting-article.html -- "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 [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
