Re: anycast and ddos

[Kim Onnel <karim.adel () gmail com>]

I've looked around most DDoS prevention methods outhere, i can safely
say that alot of them usually just repeat each other, for me it all
boils down to

1) CoPP and aggresive SPD to protect the routing/management when
infrastructure is attacked.

2) Getting Riverhead, which is a shame if they had it and it didnt save the day.

3) Netflow to detect the attacking sources/dst and using Filtering and
blackholing methods. (Arbor, open-source tools...)

So, if they had all that in place and still they were brought down,
then i would seriously like to look for new/different solutions
applied or perhaps someone on the list could give us his experience in
a case of a heavy ddos where it was easily mitigated with the above.

Regards

On 5/6/05, Fergie (Paul Ferguson) <fergdawg () netzero net> wrote:
> As one of the co-authors of RFC-2827, I'm assuming you
> meant me -- if so, no apology needed.  :-)
>
> I'm just sorry to have to see a "weakness" exploited which
> could easily be "fixed"....
>
> - ferg
>
> ps. This also seems like a good time to mention (again)
> "The Spoofer Project" at MIT:
>
>  http://momo.lcs.mit.edu/spoofer/
>
> [and]
>
>  http://momo.lcs.mit.edu/spoofer/summary.php
>
>
> -- Randy Bush <randy () psg com> wrote:
>
> it seems that anycasting was quite insufficient to protect
> netsol's service from being severely damaged (udp dead, tcp
> worked) for a considerable length of time by a ddos [0] last
> week [1].  it would be very helpful to other folk concerned
> with service deployment to understand how the service in
> question was/is anycast, and what might be done differently
> to mitigate exposure of similar services.
>
> anyone have clues or is this ostrich city?  maybe a preso at
> nanog would be educational.
>
> randy
>
> ---
>
> [0] - as it seems that the ddos sources were ip address
>       spoofed (which is why the service still worked for
>       tcp), i owe paul an apology for downplaying the
>       immediacy of the need for source address filtering.
>
> [1] - netsol is not admitting anything happened, of course
>       <sigh>.  but we all saw the big splash as it hit the
>       water, the bubbles as it sank, and the symptoms made
>       the cause pretty clear.
>
> --
> "Fergie", a.k.a. Paul Ferguson
>  Engineering Architecture for the Internet
>  fergdawg () netzero net or fergdawg () sbcglobal net
>  ferg's tech blog: http://fergdawg.blogspot.com/