Network Manager force manual DNS

Using XFCE. Seven years ago I resolved this problem in It doesn’t appear to work with my current version. Could someone please point me to a solution that might exist. Thanks in advance.

This seven year old thread describes several methods and we have no idea what are you using. Start with providing proper description what you did.

This is the file I modified.

cat /etc/sysconfig/network/config

Path: Network/General

Description: Global network configuration


Most of the options can and should be overridden by per-interface

settings in the ifcfg-* files.

Note: The ISC dhclient started by the NetworkManager is not using any

of these options – NetworkManager is not using any sysconfig settings.

Type: yesno

Default: yes

If ifup should check if an IPv4 address is already in use, set this to yes.

Make sure that packet sockets (CONFIG_PACKET) are supported in the kernel,

since this feature uses arp, which depends on that.

Also be aware that this takes one second per interface; consider that when

setting up a lot of interfaces.


Type: list(auto,yes,no)

Default: auto

If ifup should send a gratuitous ARP to inform the receivers about its

IPv4 addresses. Default is to send gratuitous ARP, when duplicate IPv4

address check is enabled and the check were sucessful.

Make sure that packet sockets (CONFIG_PACKET) are supported in the kernel,

since this feature uses arp, which depends on that.


Type: yesno

Default: no

Switch on/off debug messages for all network configuration stuff. If set to no

most scripts can enable it locally with “-o debug”.


Type: integer

Default: 30

Some interfaces need some time to come up or come asynchronously via hotplug.

WAIT_FOR_INTERFACES is a global wait for all mandatory interfaces in

seconds. If empty no wait occurs.


Type: yesno

Default: yes

With this variable you can determine if the SuSEfirewall when enabled

should get started when network interfaces are started.


Type: int

Default: 30

When using NetworkManager you may define a timeout to wait for NetworkManager

to connect in NetworkManager-wait-online.service. Other network services

may require the system to have a valid network setup in order to succeed.

This variable has no effect if NetworkManager is disabled.


Type: string

Default: “dns-resolver dns-bind ntp-runtime nis”

This variable defines the start order of netconfig modules installed

in the /etc/netconfig.d and /usr/libexec/netconfig/netconfig.d/ directories.

To disable the execution of a module, don’t remove it from the list

but prepend it with a minus sign, “-ntp-runtime”.

NETCONFIG_MODULES_ORDER=“dns-resolver dns-bind dns-dnsmasq nis ntp-runtime”

Type: yesno

Default: no

Enable netconfig verbose reporting.


Type: yesno

Default: no

This variable enables netconfig to always force a replace of modified

files and automatically enables the -f | --force-replace parameter.

The purpose is to use it as workaround, when some other tool trashes

the files, e.g. /etc/resolv.conf and you observe messages like this

in your logs on in “netconfig update” output:

ATTENTION: You have modified /etc/resolv.conf. Leaving it untouched.

Please do not forget to also report a bug as we have a system policy

to use netconfig.


Type: string

Default: “auto”

Defines the DNS merge policy as documented in netconfig(8) manual page.

Set to “” to disable DNS configuration.


Type: string(resolver,bind,dnsmasq,)

Default: “resolver”

Defines the name of the DNS forwarder that has to be configured.

Currently implemented are “bind”, “dnsmasq” and “resolver”, that

causes to write the name server IP addresses to /etc/resolv.conf

only (no forwarder). Empty string defaults to “resolver”.#


Type: yesno

Default: yes

When enabled (default) in forwarder mode (“bind”, “dnsmasq”),

netconfig writes an explicit localhost nameserver address to the

/etc/resolv.conf, followed by the policy resolved name server list

as fallback for the moments, when the local forwarder is stopped.


Type: string

Default: “”

List of DNS domain names used for host-name lookup.

It is written as search list into the /etc/resolv.conf file.


Type: string

Default: “”

List of DNS nameserver IP addresses to use for host-name lookup.

When the NETCONFIG_DNS_FORWARDER variable is set to “resolver”,

the name servers are written directly to /etc/resolv.conf.

Otherwise, the nameserver are written into a forwarder specific

configuration file and the /etc/resolv.conf does not contain any

nameservers causing the glibc to use the name server on the local

machine (the forwarder). See also netconfig(8) manual page.


Type: string

Default: “auto”

Allows to specify a custom DNS service ranking list, that is which

services provide preferred (e.g. vpn services), and which services

fallback settings (e.g. avahi).

Preferred service names have to be prepended with a “+”, fallback

service names with a “-” character. The special default value

“auto” enables the current build-in service ranking list – see the

netconfig(8) manual page – “none” or “” disables the ranking.


Type: string

Default: “”

Allows to specify options to use when writting the /etc/resolv.conf,

for example:

“debug attempts:1 timeout:10”

See resolv.conf(5) manual page for details.


Type: string

Default: “”

Allows to specify a sortlist to use when writting the /etc/resolv.conf,

for example:"

See resolv.conf(5) manual page for details.


Type: string

Default: “auto”

Defines the NTP merge policy as documented in netconfig(8) manual page.

Set to “” to disable NTP configuration.


Type: string

Default: “”

List of NTP servers.


Type: string

Default: “auto”

Defines the NIS merge policy as documented in netconfig(8) manual page.

Set to “” to disable NIS configuration.


Type: string(yes,no,)

Default: “yes”

Defines whether to set the default NIS domain. When enabled and no domain

is provided dynamically or in static settings, /etc/defaultdomain is used.

Valid values are:

- “no” or “” netconfig does not set the domainname

- “yes” netconfig sets the domainname according to the

NIS policy using settings provided by the first

iterface and service that provided it.

- “<interface name>” as yes, but only using settings from interface.


Type: string

Default: “”

Defines a default NIS domain.

Further domain can be specified by adding a “_<number>” suffix to


variables, e.g.: NETCONFIG_NIS_STATIC_DOMAIN_1=“second”.


Type: string

Default: “”

Defines a list of NIS servers for the default NIS domain or the

domain specified with same “_<number>” suffix.


Type: string

Default: ‘’

Set this variable global variable to the ISO / IEC 3166 alpha2

country code specifying the wireless regulatory domain to set.

When not empty, ifup-wireless will be set in the wpa_supplicant

config or via ‘iw reg set’ command.

Note: This option requires a wpa driver supporting it, like

the ‘nl80211’ driver used by default since openSUSE 11.3.

When you notice problems with your hardware, please file a

bug report and set e.g. WIRELESS_WPA_DRIVER=‘wext’ (the old

default driver) in the ifcfg file.

See also “/usr/sbin/wpa_supplicant --help” for the list of

available wpa drivers.


Type: integer

Default: “”

How log to wait for IPv6 autoconfig in ifup when requested with

the auto6 or +auto6 tag in BOOTPROTO variable.

When unset, a wicked built-in default defer time (10sec) is used.


Type: list(all,dns,none,"")

Default: “”

Whether to update system (DNS) settings from IPv6 RA when requested

with the auto6 or +auto6 tag in BOOTPROTO variable.

Defaults to update if autoconf sysctl (address autoconf) is enabled.


Type: list(auto,yes,no)

Default: “auto”

Permits to specify/modify a global ifcfg default. Use with care!

This settings breaks rules for many things, which require carrier

before they can start, e.g. L2 link protocols, link authentication,

ipv4 duplicate address detection, ipv6 duplicate detection will

happen “post-mortem” and maybe even cause to disable ipv6 at all.

See also “man ifcfg” for further information.


Type: string

Default: “”

Allows to specify a comma separated list of debug facilities used

by wicked. Negated facility names can be prepended by a “-”, e.g.:


When set, wicked debug level is automatically enabled.

For a complete list of facility names, see: “wicked --debug help”.


Type: list("",error,warning,notice,info,debug,debug1,debug2,debug3)

Default: “”

Allows to specify wicked debug level. Default level is “notice”.


I believe the only modification was…


Yet another solution wich works since years flawlessly:

I got as far as the instruction…

cat /etc/systemd/network/  
cat: /etc/systemd/network/ No such file or directory

I have now lost my Internet connection totally, and rebooting does not help. What can I do to recover as it’s hard to communicate with no connection?

Plus there is nothing in the /etc/systemd/network directory.

You need to create a file with name ending in ".network’ and the following content:

**6700k:~ #** cat /etc/systemd/network/  
Name=w* # Wireless link

DHCP=yes # Select your domain
**6700k:~ #**

**6700k:~ #** ll /etc/sysconfig/network/config /etc/systemd/network/ 
-rw-r--r-- 1 root root 8160 Sep 24 03:19 /etc/sysconfig/network/config 
-rw-r--r-- 1 root root   54 Sep 24 04:03 /etc/systemd/network/ 
**6700k:~ #**

/etc/sysconfig/network/config is complex. /etc/systemd/network/ is simple and concise.

More complications. I am in rural Greece with a notebook and a poor connection and moving every few days. Your instructions are a little too complicated for me to follow at this time. How do I get back to where I was before I made any changes? Must I re-install using a connection that breaks every few minutes?

i have no idea about changes made.:(Why do you want to reinstall?:frowning: You need to tell what you did.:wink:

I read this as that you think that the cat statement broke your networking. Is that true?

Of course not. I didn’t understand I needed to create a file with that in it.

All is well. I followed your link and I can connect again. I do appreciate your effort and advice and will follow it again now that I understand what I did wrong and have a solution for undoing any mistakes. Thank you for your help.