Re: Subnet Mask

From: Hank Nussbacher (hank@att.net.il)
Date: Thu Mar 28 2002 - 14:00:18 EST


At 07:18 PM 28-03-02 +0100, Gert Doering wrote:
>Hi,
>
>On Thu, Mar 28, 2002 at 03:10:45PM -0300, Giuliano Cardozo Medalha wrote:
> > Yesterday nigth a very good system analyst give me a lot of explanation
> > about it.
>
>If this system analyst was *good*, there would not be any need to ask.
>
> > Nobody knows how the algorithm implemented by CISCO or Extreme or Juniper
> > works !!!
>
>If you want to see source code, look into the Linux or BSD kernel
>networking code. The basic stuff ("lookup of IP routes and masks")
>has to follow the same rules everywhere.

Not always. Read "Routing with a Clue":
http://www.acm.org/sigcomm/sigcomm99/papers/session6-1.html

-Hank

>Vendors have their optimizations, of course, making this lookup faster,
>adding caching, or implementing it in specialized hardware. But the
>basic principle is usually similar.
>
>gert
>--
>USENET is *not* the non-clickable part of WWW!
>
>//www.muc.de/~gert/
>Gert Doering - Munich, Germany gert@greenie.muc.de
>fax: +49-89-35655025 gert.doering@physik.tu-muenchen.de



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