Re: DOS?

[Phil Rosenthal <pr () isprime com>]

On 1/25/03 2:00 AM, "Christopher J. Wolff" <chris () bblabs com> wrote:

> Greetings,
>
> It looks like all hell is breaking loose on some of the nations
> backbones.  http://www.internethealthreport.com
>
> The port counters on my AT&T DS3 were reading in the 250 megabit range,
> that is a DS3, mind you.
>
> Any source IP's I can add to the circular file would be appreciated.
> Any ranges I find I'll echo back to the list.
>
> Regards,
> Christopher J. Wolff, VP CIO
> Broadband Laboratories, Inc.
> http://www.bblabs.com
You need a filter similar to this (in junos format):

> show configuration firewall filter filter-012503
term deny-dos {
    from {
        packet-length 404;
        protocol udp;
        destination-port 1434;
    }
    then {
        count codered-4;
        discard;
    }
}
term allow-rest {
    then accept;
}



--Phil
ISPrime