[dns-operations] dealing with DDoS/amplification attacks
jim at rfc1035.com
Mon Jun 18 12:15:57 UTC 2012
On 18 Jun 2012, at 12:36, Kostas Zorbadelos wrote:
> Stephane Bortzmeyer <bortzmeyer at nic.fr> writes:
>> If you don't do ingress filtering, it still allows people to attack
>> your users (they can send from the outside a "ANY ripe.net" query
>> claiming to be from a local machine).
> The same is true if you have open resolvers / forwarders in your
> networks (problem CPEs for example) and they accept spoofed queries
> from the outside.
> What is the proposed mitigation for the ISP caching resolver in
> these cases?
Don't do that. :-)
If the attack packets have a format that can easily be filtered to /
dev/null, it should be possible (handwave, handwave!) to make a
firewall or router drop these at the ingress point(s) into your network.
And then go chase the upstream providers who are dumping this crap on
Statements of the bleedin' obvious...
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