Re: DNS lookup bypassing the system settings

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On Tue, 29 Sep 2020 14:55:28 -0700
Samuel Sieb <samuel@xxxxxxxx> wrote:

> On 9/29/20 8:29 AM, stan via users wrote:
> >>> This is not the reality I live in though. New-style high level
> >>> programming languages tend to avoid being just a wrapper around C
> >>> APIs. And thus they implement minimal DNS clients themselves,
> >>> ignoring the LLMNR, mDNS and so on.  
> >>
> >> Not just for DNS. For SMTP, HTTP, etc.  
> 
> This is kind of a silly statement.  There isn't a standard library
> for smtp and http clients although there are libraries like libcurl.
> 
> >> The modern way of coding apps is minimal marginally-compliant and
> >> secure built-in network client (so things sort of work on the dev
> >> system and in CI/CD unit tests), with the OS interposing a
> >> full-featured protocol proxy in “production” deployments.  
> > 
> > For me, the implication of that is that I am no longer in control of
> > DNS, etc.  If some program has hard coded DNS servers, they bypass
> > everything and just ignore system settings.  Am I understanding
> > correctly?  
> 
> Just because they implement a DNS client doesn't mean they ignore the 
> system settings or have hard-coded servers.
> 
> > In particular, I'm thinking about firefox, since as part of that
> > thread it emerged that browsers are including their own DNS clients
> > with things like DOH and DOT.  Before I start knot-resolver,
> > firefox cannot reach the web.  Is that an indication that it does,
> > in fact, use my DNS resolver?  
> 
> DOT doesn't bypass your DNS servers and Firefox has DOH disabled by 
> default in Fedora.

Thank you.
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