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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 11:35:25PM +0300, Reco wrote:
> On Thu, 24 Aug 2017 22:21:04 +0200
> Pascal Hambourg <pascal@plouf.fr.eu.org> 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.
> 
> Appropriate dhclient hook should do this trick.
> I'd start with copying and modifying resolvconf one.
> 
> 

I think the concept of "appropriate dhclient hook" might be exactly what 
I was after -- could an "appropriate dhclient hook" perhaps be used to 
update the name servers being offered by the DHCP server? And would that 
be done by updating dhcp.conf and restarting the dhcp server, or would 
that cause other problems?

And, is dhclient a separate piece of software from systemd.networkd? 
Because I am using the latter at the moment to get the IP address from 
the ISP on the firewall machine, although I am not married to that 
method, it's just that it was super-easy to set up and worked first 
time, so I never had reason to look for an alternative.

Mark

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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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