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    SubjectRe: [PATCH] OpenBSD Networking-related randomization port
    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]:

    "The default Linux TCP/IP-stack has some properties that make it more
    vulnerable to prediction-based hacks. By randomizing several items,
    predicting the behaviour will be a lot more difficult."

    "Randomized IP IDs hinders OS fingerprinting and will keep your machine
    from being a bounce for an untraceable portscan."


    PS: Thanks for CC'ing me, I forgot to mention that I'm not subscribed to
    the list, I just read the archives and reply by getting the original
    mbox-formatted messages.
    Lorenzo Hernández García-Hierro <>
    [1024D/6F2B2DEC] & [2048g/9AE91A22][]
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