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My environment is following, all cabled with gigalan, all latest Debian 9, vm with virtualbox on 2 different physical hosts.

  • A mikrotik internet router which acts as DHCPD
    • I configured it setting the domain (myCompany.local)
    • To give always the same IP to following machines
  • A virtualmachine (Debian BIND9) in my environment (physical host 1)
  • Have different client virtual machines lets say vm1, vm2 (Physical host 1)
  • My workstation which the only difference I know is it has a wlan0 interface

My ultimate goal is not having to configure the workstations and let the DHCP Server give the domain (myCompany.local) and the IP Address of DNS Server. I read that there are some practices that don't seem to do like that. So I don't know if

  • my approach is wrong
  • my configuration is wrong
  • I'm wrong
  • There is a computer world conspiracy ;-)
  • In some machines the network-manager from plasma takes the hand over the other network manager (which I understood is the network service which takes dhclient with /etc/dhcp/dhclient.conf as config file to give requests to the server??!!
  • I'm really wrong about all that

Here is my configuration:

/etc/hosts

127.0.0.1       localhost.localdomain   localhost
127.0.1.1       localhost myLptp        myLptp.myCompany.local

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
**strong text**

/etc/network/interfaces

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

auto wlan0

allow-hotplug eth0
iface eth0 inet dhcp

on myLptp /etc/resolv.conf automatically configured by dhclient

nameserver 8.8.4.4

on vms /etc/resolv.conf automatically configured by dhclient

# Generated by NetworkManager
search myDomain.local
nameserver 172.16.10.174
  • You should make sure your interfaces are either being managed by static configuration or NetworkManager only. – CameronNemo Aug 3 '18 at 2:15
  • @CameronNemo how do I do that? – Philippe Gachoud Aug 3 '18 at 11:32
  • maybe part of the answer is that, on my not working machine /etc/resolv.conf is a static file and on the other workings, it is a symlink /var/run/NetworkManager/resolv.conf – Philippe Gachoud Aug 3 '18 at 13:05
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Seems that part of the answer of my problem was following. I don't know why, but the attributes of the file were changed so that it was immutable.

~$ lsattr /etc/resolv.conf
----i---------e---- /etc/resolv.conf

When I sudo chattr -i /etc/resolv.conf everything came to normal and I could get the first domain and nameserver from DHCP Client

~$ lsattr /etc/resolv.conf
--------------e---- /etc/resolv.conf

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