Re: Forcing dhclient to not ignore tun0 interface when it's available

From	David Wright <deblis@lionunicorn.co.uk>
Newsgroups	linux.debian.user
Subject	Re: Forcing dhclient to not ignore tun0 interface when it's available
Date	2023-03-07 05:10 +0100
Message-ID	<G6wOd-aGMP-1@gated-at.bofh.it> (permalink)
References	(4 earlier) <G2CyR-87VI-3@gated-at.bofh.it> <G4OFA-9wY9-15@gated-at.bofh.it> <G53XX-9GK9-5@gated-at.bofh.it> <G569r-9IoC-3@gated-at.bofh.it> <G6hYR-axrX-5@gated-at.bofh.it>
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On Mon 06 Mar 2023 at 13:17:23 (+0100), davenull@tuxfamily.org wrote:
> On 2023-03-03 06:22, Max Nikulin wrote:
> > On 03/03/2023 10:08, Tim Woodall wrote:
> > > New to this thread, so might be totally off-piste but openvpn
> > > has hooks
> > > to run scripts like this:
> > ...
> > > This is server side but the route-up/pre-down work client side too.
> 
> Since it's workplace's VPN, which I don't have access to, I can't do
> anything which requires server-side access.
> Plus, it's a Cisco VPN. I don't anythig aout cisco stuff. I'm more
> familiar with openVPN
> 
> > > 
> > > Presumably you can do something here to renew dhcp leases or restore
> > > resolv.conf.
> > 
> > Perhaps the opposite. dhclient running for enp2s0f0 should detect that
> > VPN is active and to avoid overwriting DNS settings that direct
> > requests to tun0.
> 
> Yes, indeed. I want dhclient to NOT overwrite /etc/resolv.conf when
> VPN is active. OR to use tun05 when it tries to renew the lease
> 
> One person at work suggested to use resolvectl/resolvconf but after
> looking at it, I noticed it requires using sytemd-resolved, which
> I don't use.

  Package: resolvconf
  Depends: lsb-base (>= 4.1+Debian3), debconf (>= 0.5) | debconf-2.0

AIUI systemd-resolved is a replacement for openresolv, and it's
systemd-networkd that can work alongside openresolv.

> As an alternative, there is openresolv, which seems work without
> resolved. But I failed to find any document on how to useit with
> openconnect.

Yes, no dependencies.

Openconnect will supply openresolv with the information it needs
when the vpnc-script that we discussed earlier runs. It's at the
function "modify_resolvconf_manager", around line 690.

> The official website config page only gives parameters for some
> well-known local resolvers, including unbound.

It also covers Bind, named (a part of bind), and dnsmasq
(mentioned in that script). All these are in Debian.

> If anyone has a good documention on how to configure openresolv
> correctly to use it with openconnect.

I see that the openresolv wiki at Arch has a section on openconnect.
Obviously you may need to "bend" their pages when consulting them
for Debian.

> Thing is : years ago I used to use OpenVPN on debian on another
> computer, the DHCP client was also dhclient
> but I didn't to do any extra configuration, it just worked… The only
> differences was an older debian version,
> as the stable batk them was like Debian 7 or 8, and I was using wicd
> instead. So the network stuff probably changed since then
> 
> Therefore I have no damn idea on how to configure stuff like openresolv.

Cheers,
David.

Thread

Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-22 18:20 +0100
  Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Roberto C. Sánchez <roberto@debian.org> - 2023-02-22 18:30 +0100
  Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Christoph Brinkhaus <c.brinkhaus@t-online.de> - 2023-02-22 18:40 +0100
    Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-23 11:40 +0100
      Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Reco <recoverym4n@enotuniq.net> - 2023-02-23 18:20 +0100
  Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Greg Wooledge <greg@wooledge.org> - 2023-02-22 19:30 +0100
  Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable David Wright <deblis@lionunicorn.co.uk> - 2023-02-22 22:10 +0100
    Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-23 10:50 +0100
      Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable <tomas@tuxteam.de> - 2023-02-23 11:00 +0100
        Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-23 11:40 +0100
      Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable David Wright <deblis@lionunicorn.co.uk> - 2023-02-24 06:40 +0100
        Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable <tomas@tuxteam.de> - 2023-02-24 06:50 +0100
        Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-24 10:30 +0100
          Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable <tomas@tuxteam.de> - 2023-02-24 10:30 +0100
            Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-24 11:30 +0100
              Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable tomas@tuxteam.de - 2023-02-24 11:50 +0100
              Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-27 15:20 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Greg Wooledge <greg@wooledge.org> - 2023-02-27 15:40 +0100
          Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Greg Wooledge <greg@wooledge.org> - 2023-02-24 13:30 +0100
          Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable David Wright <deblis@lionunicorn.co.uk> - 2023-02-25 01:30 +0100
          Forcing dhclient to not ignore tun0 interface when it's available davenull@tuxfamily.org - 2023-03-02 11:50 +0100
            Re: Forcing dhclient to not ignore tun0 interface when it's  available Tim Woodall <debianuser@woodall.me.uk> - 2023-03-03 04:10 +0100
              Re: Forcing dhclient to not ignore tun0 interface when it's available Max Nikulin <manikulin@gmail.com> - 2023-03-03 06:30 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's  available Tim Woodall <debianuser@woodall.me.uk> - 2023-03-03 07:40 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available Max Nikulin <manikulin@gmail.com> - 2023-03-03 16:10 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available David Wright <deblis@lionunicorn.co.uk> - 2023-03-03 16:20 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available davenull@tuxfamily.org - 2023-03-06 13:40 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available David Wright <deblis@lionunicorn.co.uk> - 2023-03-07 05:10 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available davenull@tuxfamily.org - 2023-03-07 17:20 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available David Wright <deblis@lionunicorn.co.uk> - 2023-03-10 02:00 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available davenull@tuxfamily.org - 2023-03-06 13:20 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available David Wright <deblis@lionunicorn.co.uk> - 2023-03-07 05:10 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available davenull@tuxfamily.org - 2023-03-07 17:00 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available Max Nikulin <manikulin@gmail.com> - 2023-03-07 16:30 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available davenull@tuxfamily.org - 2023-03-07 18:00 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available David Wright <deblis@lionunicorn.co.uk> - 2023-03-10 02:00 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available davenull@tuxfamily.org - 2023-03-10 09:50 +0100
            Re: Forcing dhclient to not ignore tun0 interface when it's available David Wright <deblis@lionunicorn.co.uk> - 2023-03-03 06:30 +0100
              Re: Forcing dhclient to not ignore tun0 interface when it's available davenull@tuxfamily.org - 2023-03-03 18:10 +0100
                Re: Forcing dhclient to not ignore tun0 interface when it's available David Wright <deblis@lionunicorn.co.uk> - 2023-03-04 18:40 +0100
  Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable Cindy Sue Causey <butterflybytes@gmail.com> - 2023-02-23 02:30 +0100
    Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong configuration, on debian stable conover@panix.com (John Conover) - 2023-02-23 03:20 +0100
      Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-23 11:30 +0100
        Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable Jeremy Ardley <jeremy@ardley.org> - 2023-02-23 11:40 +0100
        Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable David Wright <deblis@lionunicorn.co.uk> - 2023-02-28 05:30 +0100
          Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-02-28 16:10 +0100
            Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Tixy <tixy@yxit.co.uk> - 2023-02-28 17:00 +0100
            Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable David Wright <deblis@lionunicorn.co.uk> - 2023-03-02 00:30 +0100
              Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-03-02 10:40 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Greg Wooledge <greg@wooledge.org> - 2023-03-02 13:40 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-03-02 13:50 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-03-02 14:10 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Greg Wooledge <greg@wooledge.org> - 2023-03-02 14:20 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable davenull@tuxfamily.org - 2023-03-02 16:20 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable David <bouncingcats@gmail.com> - 2023-03-02 16:40 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with wrong  configuration, on debian stable David <bouncingcats@gmail.com> - 2023-03-02 16:20 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable Curt <curty@free.fr> - 2023-03-02 18:30 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable David Wright <deblis@lionunicorn.co.uk> - 2023-03-02 19:20 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable <tomas@tuxteam.de> - 2023-03-02 20:30 +0100
                Re: Debugging what is deleting/recreating /etc/resolv.conf with  wrong configuration, on debian stable David Wright <deblis@lionunicorn.co.uk> - 2023-03-03 06:20 +0100

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