[AusNOG] DDOS mitigation

[Joshua D'Alton]

good points. and this is why it falls back on the originating networks to
fix their problems ie udp spoof so that they arent sending so much traffic
in the first place. obviously not much of a fix and they have no motivation
to ( more traffic out = more transit sold to downstreams).. but...

sent from android
On May 12, 2013 9:22 AM, "Phillip Grasso" <phillip.grasso at gmail.com> wrote:

> my pessimistic 2cents.
>
> Attack volumes should continue to grow proportionally with defensive
> capability, the capability would reduce to fewer possible attackers (less
> script kiddies, more large scale professional botnets and state sponsored
> ops). 40-100G attacks happen now for big targets but my guess it will be
> common place for rest of market in near future. The bigger risk is how does
> this affect the second / third tier service providers not able to protect
> themselves from these types of attacks and what "protection" costs would be
> required from upstream providers. Already some large providers charge for
> "DDoS protection".
>
> Capacity based DDoS attacks obviously can hurt, but its well known and
> mostly can be overcome with some filtering, blackholing etc. There are
> other vectors are increasingly growing concerned e.g.  Rolands prior ausnog
> talk; (where firewalls fall over). Infrastructure weakness attacks can have
> a greater impact for more sustained period. attacking specific weaknesses
> in BGP or TCP stacks, or exceeding forwarding rates on devices (not
> capacity).
>
> On another note;
> There's a possible huge economic and market cost here; it "may" mean that
> smaller players have harder time to operate against the larger operators
> that can provide protections at scale. It requires players to have
> significantly greater amount of network capacity (or infrastructure
> hardware capacity then needed) A large player can do with less of this and
> overall percentage of headroom may be minimal. It would be really hard for
> smaller operators to exist in market without clear 'protection' from larger
> operators / upstreams.
>
>
>
>
> On Fri, May 10, 2013 at 11:18 PM, James Braunegg <
> james.braunegg at micron21.com> wrote:
>
>> Dear Roland
>>
>> Nice feature.... back to school I must go ;)
>>
>> Kindest Regards
>>
>> James Braunegg
>> W:  1300 769 972  |  M:  0488 997 207 |  D:  (03) 9751 7616
>> E:   james.braunegg at micron21.com  |  ABN:  12 109 977 666
>>
>>
>>
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>>
>> -----Original Message-----
>> From: ausnog-bounces at lists.ausnog.net [mailto:
>> ausnog-bounces at lists.ausnog.net] On Behalf Of Dobbins, Roland
>> Sent: Friday, May 10, 2013 11:13 PM
>> To: ausnog at lists.ausnog.net
>> Subject: Re: [AusNOG] DDOS mitigation
>>
>>
>> On May 10, 2013, at 7:51 PM, James Braunegg wrote:
>>
>> >  Have you had enough capacity to be able to absorb attacks thus collect
>> metrics or have the attacks been larger than your capacity and hence
>> requiring the need for S/RTBH thus losing the ability to measure the true
>> size of the attack ?
>>
>> S/RTBH doesn't in and of itself take away one's visibility into traffic
>> on platforms with decent flow telemetry support - dropped traffic is still
>> tabulated, with the destination ifindex set to 0.
>>
>> Notable exceptions are pre-Sup2T Cisco 6500s/7600s, & pre-Sup7 Cisco
>> 4500s.
>>
>> -----------------------------------------------------------------------
>> Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>
>>
>>           Luck is the residue of opportunity and design.
>>
>>                        -- John Milton
>>
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