Re: smurf's attack...

[Jon Green <jcgreen () netins net>]

On Fri, 5 Sep 1997 15:24:58 -0400, jordyn () bestweb net writes:

> We're also using the following extended access list (along with
> anti-spoofing filters) to prevent smurf attacks from originating from our
> network:
>
> access-list XXX deny ip any 0.0.0.255 255.255.255.0


Folks, this is a bad idea.  There are lots of completely valid IP
addresses out there that end in .255.  True, most of them that
end in .255 ARE broadcast addresses, but if people implement this
kind of filtering on a large scale, it really breaks classless IP.

But that's just IMHO. :)

-Jon

     -----------------------------------------------------------------
    *      Jon Green            *         "Life's a dance             *
   *   jcgreen () netINS net       *          you learn as you go"        *
  *  Finger for Geek Code/PGP   *                                       *
 *  #include "std_disclaimer.h" * http://www.netins.net/showcase/jcgreen *
 -------------------------------------------------------------------------