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Re: DHCP server that itself gets an IP address by DHCP

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On Thu, Aug 24, 2017 at 04:39:13PM -0400, Greg Wooledge wrote:
> On Thu, Aug 24, 2017 at 10:21:04PM +0200, Pascal Hambourg wrote:
> > Le 24/08/2017 à 11:30, Reco a écrit :
> > > 
> > > Somewhat hackish, but straightforward way to achieve this is to redirect
> > > DNS requests from your LAN to correct DNS. Something like this should do
> > > the trick:
> > 
> > Not so straightforward because you still need to get the ISP's DNS and
> > update the iptables rules whenever the DNS change.
> 
> I strongly recommend just running your own caching DNS resolver on the
> DHCP server host.  ISP nameservers are often slow and unreliable.
> 

OK, thanks for the advice. One possibly stupid question though... 
whenever a DNS server running on my own firewall doesn't have an answer 
to a DHCP query, it is going to broadcast it out... to the ISP's DNS 
servers, no? So I'm not actually getting away from the ostensibly slow 
(which I could easily believe) and/or unreliable (which I've never seen 
evidence of) ISP DNS servers, just by installing my own.

I suppose I could override my resolv.conf somehow on my firewall machine 
to use DNS servers regarded as fast and reliable. But I doubt any of 
those are physically close to me here in Japan -- eg Google's are no 
doubt in the US, about as far away from me as it is possible to get 
while still being on planet Earth. Hard to imagine that is going to be 
faster. Or am I missing the point?

And, in terms of a local caching DNS server -- would BIND be the 
recommended solution?

Thanks

Mark

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Thread

Re: DHCP server that itself gets an IP address by DHCP Reco <recoverym4n@gmail.com> - 2017-08-24 11:40 +0200
  threading, was Re: DHCP server that itself gets an IP address by DHCP David Wright <deblis@lionunicorn.co.uk> - 2017-08-24 15:30 +0200
    Re: threading, was Re: DHCP server that itself gets an IP address  by DHCP Reco <recoverym4n@gmail.com> - 2017-08-24 17:10 +0200
  Re: DHCP server that itself gets an IP address by DHCP Pascal Hambourg <pascal@plouf.fr.eu.org> - 2017-08-24 22:30 +0200
    Re: DHCP server that itself gets an IP address by DHCP Greg Wooledge <wooledg@eeg.ccf.org> - 2017-08-24 22:40 +0200
      Re: DHCP server that itself gets an IP address by DHCP Mark Fletcher <mark27q1@gmail.com> - 2017-08-25 00:40 +0200
        Re: DHCP server that itself gets an IP address by DHCP Greg Wooledge <wooledg@eeg.ccf.org> - 2017-08-25 14:20 +0200
          Re: DHCP server that itself gets an IP address by DHCP Mark Fletcher <mark27q1@gmail.com> - 2017-08-25 15:20 +0200
            Re: DHCP server that itself gets an IP address by DHCP Greg Wooledge <wooledg@eeg.ccf.org> - 2017-08-25 16:00 +0200
    Re: DHCP server that itself gets an IP address by DHCP Reco <recoverym4n@gmail.com> - 2017-08-24 22:40 +0200
      Re: DHCP server that itself gets an IP address by DHCP Mark Fletcher <mark27q1@gmail.com> - 2017-08-25 00:30 +0200
        Re: DHCP server that itself gets an IP address by DHCP Reco <recoverym4n@gmail.com> - 2017-08-25 10:20 +0200
        Re: DHCP server that itself gets an IP address by DHCP Greg Wooledge <wooledg@eeg.ccf.org> - 2017-08-25 14:20 +0200

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