Re: SMURF amplifier block list

[Dean Anderson <dean () av8 com>]

At 3:21 PM -0400 4/18/98, Alex P. Rudnev wrote:
> > During an in progress attack, you probably have to take extreme measures,
> Do you remember - it's not attack against you or attack by some of your
> customer's networks used as amplifier, but the attack initiated from your
> own network. You never note such thing withouth some permanent
> measurement.
>
> It's why we saw this 100% helpless against the SMURF's.

But to protect your own network, all you need is the access rule I gave.
You know your own broadcast address and netmask, and can put in a rule to
block.

You just can't block the presumed broadcast address used by other peoples
networks.

Logging attempted attacks which are blocked can't really be done with a
cisco.  You need something to monitor the line coming in.

                --Dean


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
           Plain Aviation, Inc                  dean () av8 com
           LAN/WAN/UNIX/NT/TCPIP/DCE      http://www.av8.com
           We Make IT Fly!                (617)242-3091 x246
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++