UDP Amplification DDoS - Help!

Faisal Imtiaz faisal at snappytelecom.net
Tue Feb 9 02:55:58 UTC 2016


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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