Re: [gentoo-user] How to prevent a dns amplification attack

[Michael Mol <mikemol@gmail.com>]

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On 03/29/2013 07:01 PM, William Kenworthy wrote:
> On 30/03/13 06:34, Paul Hartman wrote:
>> On Thu, Mar 28, 2013 at 7:49 PM, Peter Humphrey
>> <peter@humphrey.ukfsn.org> wrote:
>>> On Thursday 28 March 2013 20:53:49 Paul Hartman wrote:
>>>
>>>> In my case, my ISP's DNS servers are slow (several seconds to reply),
>>>> fail randomly when they should resolve, return an IP (which goes to
>>>> their ad-laden "helper" website if you are using a web browser) when
>>>> they should instead return nxdomain, and they have openly admitted to
>>>> selling customer DNS lookup history to marketers for targeted
>>>> advertising.
>>>
>>>
>>>
>>> That is just evil. Have you no alternative to this ISP?
>>
>> Not really.
>>
>> I have a 100 megabit connection through the cable company; my only
>> wired alternative is DSL (1.5 mbit for almost half the price I'm
>> paying for 100mbit). Cellular or satellite are not viable options for
>> me because of comparatively poor value, latency and miniscule data
>> usage caps.
>>
> 
> Can you do a tunnel to a cheap vsp instance that can access an external
> dns, and feed all your dns queries through it?  Considering the problems
> with your existing setup, that looks attractive and you can have sane
> fallbacks if neccessary.
> 
> I tried this to avoid the "Australia Tax" when online shopping overseas
> and the small additional latency didnt seem to be a problem.

Doesn't even need to be that complicated.

Set up a free tunnel with tunnelbroker.net, and use Hurricane Electric's
provided IPv6 DNS servers. They run the tunnel service as a loss-leader,
and if they're doing anything funky with their DNS data, I haven't heard
about it.

Chances are, the local ISP won't be filtering traffic flowing across a
proto41 tunnel. (IPv6 packet as an IPv4 packet payload. It's called a
proto41 tunnel because 41 is placed in the "next protocol" field in the
IPv4 packet.)



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