D/DoS mitigation hardware/software needed.

Suresh Ramasubramanian ops.lists at gmail.com
Tue Jan 5 03:13:01 UTC 2010

On Tue, Jan 5, 2010 at 8:36 AM, Jeffrey Lyon
<jeffrey.lyon at blacklotus.net> wrote:
> We have such a configuration in progress, it works great without any of the
> issues you're proposing.

So .. this is interesting.

The firewall would have to frontend your mail / web / whatever
application .. and if something goes beyond the firewall's rated
capacity (100k ++ - maybe nearly 150..175k connections per second for
a high end firewall), the firewall falls over.

And even before that, there's the risk of whatever application you're
protecting getting pounded flat if your firewall passes even a small
percentage of this traffic.

Do you -

1. Have (say) two firewalls in HA config?

2. Back your firewall with routing based measures, S/RTBH, blackhole
communities your upstream offers, etc [the standard nspsec bootcamp

3. Simply back the firewall with a netflow based device?

4. Estimate that the risk of a DDoS that exceeds your firewall's rated
capacity is extremely low?  [and yes, 150k ++ connections per second
ddos is going to be massive, and relatively rare for most people]


Suresh Ramasubramanian (ops.lists at gmail.com)

More information about the NANOG mailing list