Re: Mozilla Firefox DoH to CloudFlare by default (for US users)?
Am 10.09.2019 um 07:50 schrieb Florian Lohoff <f@zz.de>:
> On Mon, Sep 09, 2019 at 03:31:37PM +0200, Bjørn Mork wrote:
>> I for one, do trust my ISPs a lot more than I trust Cloudflare or
>> Google, simply based on the jurisdiction.
> There are tons of setups which are fine tuned for latency because they
> are behind sat links etc or low bandwidth landlines. They have dns
> caches with prefetching to reduce typical resolve latency down to sub
> milliseconds although your RTT to google/cloudflare is >1000ms.
>
> Switching from your systems resolver fed by DHCP to DoH in Firefox will
> make the resolve latency go from sub ms to multiple seconds as the
> HTTP/TLS handshake will take multiple RTT. This will effectively break
> ANY setup behind Sat links e.g. for example all cruise ships at
> sea.
I can confirm (based on experiences on my day job) that this can be a real problem and affecting thousands and hundredthousands of users.
Having the *option* to use DoH is maybe a good idea, but making it the default is not.
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