Mitigate UDP Broadcast DDoS Attacks

Hi,

Could somebody please share some methods to Mitigate UDP Broadcast DDoS Attacks ?

Thanks!
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g0allAsked:
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naderzCommented:
Here is a good start. This is from Cisco, but the principals can be applied to other platforms.

http://www.cisco.com/en/US/tech/tk59/technologies_white_paper09186a0080174a5b.shtml
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g0allAuthor Commented:
Thank you, interesting generic document.

I'm still not able to understand if  mitigating DDoS UDP Broadcast  Attacks is possible and if so, how?
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naderzCommented:
There is always new ways of attacks. But, I can think of the following steps that as a general rule should mitigate against "broadcast" attacks:

1. Turn off directed broadcasts: on Cisco routers this is done by "no ip directed-broadcast" interface command.
2. Turn off "chargen" and "ICMP Echo reply"
3. Do not allow forwarding of broadcast traffic on routers. This is off by default. Make sure it stays that way.
4. Use " ip verify unicast reverse-path " command.
5. Use an IDS at the perimeter of the network to detect attacks.
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naderzCommented:
In addition and prior to above configurations you should have a network design that limits and confines broadcast domains by using VLANs.
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