UDP Amplification DDoS - Help!

Andrew Kirch trelane at trelane.net
Tue Feb 9 02:58:52 UTC 2016

use a CDN provider or AWS ELBs or something to absorb the attacks?

On Mon, Feb 8, 2016 at 9:55 PM, Faisal Imtiaz <faisal at snappytelecom.net> wrote:
> Not quite sure what kind of info / confirmation you are looking for...
> There are lots of articles (do a google search) on this topic as well as mitigation ...
> e.g.
> http://blog.nexusguard.com/ssdp-ddos-attacks/
> &
> https://tools.ietf.org/html/bcp38
> Regards
> Faisal Imtiaz
> Snappy Internet & Telecom
> ----- Original Message -----
>> From: "Mitch Dyer" <mdyer at development-group.net>
>> To: "nanog list" <nanog at nanog.org>
>> Sent: Monday, February 8, 2016 6:14:06 PM
>> Subject: UDP Amplification DDoS - Help!
>> Hello,
>> Hoping someone can point me in the right direction here, even just confirming my
>> suspicions would be incredibly helpful.
>> A little bit of background: I have a customer I'm working with that is
>> downstream of a 1Gb link that is experiencing multiple DDoS attacks on a daily
>> basis. Through several captures I've seen what appear to be a mixture of SSDP
>> and DNS amplification attacks (though not at the same time). The attack itself
>> seems to target the PAT address associated with a specific site, if we change
>> the PAT address for the site, the attack targets the new address at the next
>> occurance. We've tried setting up captures and logging inside the network to
>> determine if the SSDP/DNS request originate within the network but that does
>> not appear to be the case.
>> We've reached out for some assistance from the upstream carrier but they've only
>> been able to enforce a 24-hour block.
>> I'm hoping someone with some experience on this topic would be able to shed some
>> light on a better way to attack this or would be willing to confirm that we are
>> simply SOL without prolonged assistance from the upstream carrier.
>> Thanks in advance for any insight.
>> Mitch

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