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Question on nmcli on Ubuntu 20.04

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Jerry Geis

Question on nmcli on Ubuntu 20.04

I am using this command:

nmcli connection modify 'Wired connection 1' ipv4.method manual ipv6.method ignore autoconnect yes ipv4.addr 192.168.1.19/22 gw4 192.168.1.1 ipv4.dns 192.168.1.14

to set static address and the DNS. everything seems to work except setting the DNS.

The /etc/resolv.conf file still shows 127.0.0.53 and not the 192.168.1.14

Why is that ? What did I not do correctly ?

Thanks

jerry

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David Fletcher-5

Re: Question on nmcli on Ubuntu 20.04

On Fri, 2020-12-18 at 11:47 -0500, Jerry Geis wrote:
> I am using this command:
> nmcli connection modify 'Wired connection 1' ipv4.method manual
> ipv6.method ignore autoconnect yes ipv4.addr 192.168.1.19/22 gw4
> 192.168.1.1 ipv4.dns 192.168.1.14
>
> to set static address and the DNS.

I assume you're setting up 20.04 server? I just (from my installation
and configuration notes) did this:-

See
https://www.tecmint.com/configure-network-static-ip-address-in-ubuntu/
Set up networking:-
Edit /etc/netplan/???? to look like this:-

# This is the network config written by 'subiquity'
network:
ethernets:
enp2s0:
addresses:
- 192.168.2.x/24
gateway4: 192.168.2.1
nameservers:
addresses:
- 208.67.222.222
- 208.67.220.220
- 192.168.2.1
- 8.8.8.8
- 8.8.4.4
version: 2

Then do
sudo netplan apply

This is from my personal notes. Your Ethernet port name may be
different. Don't change it.

Hope that gets you going.

Dave

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Tom H-4

Re: Question on nmcli on Ubuntu 20.04

In reply to this post by Jerry Geis

On Fri, Dec 18, 2020 at 5:49 PM Jerry Geis <[hidden email]> wrote:
>
> I am using this command:
>
> nmcli connection modify 'Wired connection 1' ipv4.method manual ipv6.method ignore autoconnect yes ipv4.addr 192.168.1.19/22 gw4 192.168.1.1 ipv4.dns 192.168.1.14
>
> to set static address and the DNS. everything seems to work except
> setting the DNS.
>
< The /etc/resolv.conf file still shows 127.0.0.53 and not the
> 192.168.1.14
>
> Why is that ? What did I not do correctly ?

What's the output of "resolvectl"?

[ or of the following ]
ls -l /etc/resolv.conf
cat /run/systemd/resolve/resolv.conf

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Jerry Geis

Re: Question on nmcli on Ubuntu 20.04

On Fri, Dec 18, 2020 at 2:10 PM Tom H <[hidden email]> wrote:

On Fri, Dec 18, 2020 at 5:49 PM Jerry Geis <[hidden email]> wrote:
>
> I am using this command:
>
> nmcli connection modify 'Wired connection 1' ipv4.method manual ipv6.method ignore autoconnect yes ipv4.addr 192.168.1.19/22 gw4 192.168.1.1 ipv4.dns 192.168.1.14
>
> to set static address and the DNS. everything seems to work except
> setting the DNS.
>
< The /etc/resolv.conf file still shows 127.0.0.53 and not the
> 192.168.1.14
>
> Why is that ? What did I not do correctly ?

What's the output of "resolvectl"?

[ or of the following ]
ls -l /etc/resolv.conf
cat /run/systemd/resolve/resolv.conf

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Hi Tom,

Here are the items. Everything seems right - but its just my "expectations" when viewing /etc/resolv.conf. I thought the nameserver should be 192.168.1.14

Should it not be based on the above nmcli command ?

Jerry

# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists all
# configured search domains.
#
# Run "resolvectl status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 127.0.0.53
options edns0 trust-ad
Global
LLMNR setting: no
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no
DNSSEC NTA: 10.in-addr.arpa
16.172.in-addr.arpa
168.192.in-addr.arpa
17.172.in-addr.arpa
18.172.in-addr.arpa
19.172.in-addr.arpa
20.172.in-addr.arpa
21.172.in-addr.arpa
22.172.in-addr.arpa
23.172.in-addr.arpa
24.172.in-addr.arpa
25.172.in-addr.arpa
26.172.in-addr.arpa
27.172.in-addr.arpa
28.172.in-addr.arpa
29.172.in-addr.arpa
30.172.in-addr.arpa
31.172.in-addr.arpa
corp
d.f.ip6.arpa
home
internal
intranet
lan
local
private
test

Link 3 (wlo2)
Current Scopes: none
DefaultRoute setting: no
LLMNR setting: yes
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no

Link 2 (eno1)
Current Scopes: DNS
DefaultRoute setting: yes
LLMNR setting: yes
MulticastDNS setting: no
DNSOverTLS setting: no
DNSSEC setting: no
DNSSEC supported: no
Current DNS Server: 192.168.1.14
DNS Servers: 192.168.1.14
DNS Domain: ~.

lrwxrwxrwx 1 root root 39 Dec 18 14:18 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf

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Tom H-4

Re: Question on nmcli on Ubuntu 20.04

On Fri, Dec 18, 2020 at 8:55 PM Jerry Geis <[hidden email]> wrote:

>
> Link 2 (eno1)
> Current Scopes: DNS
> DefaultRoute setting: yes
> LLMNR setting: yes
> MulticastDNS setting: no
> DNSOverTLS setting: no
> DNSSEC setting: no
> DNSSEC supported: no
> Current DNS Server: 192.168.1.14
> DNS Servers: 192.168.1.14
> DNS Domain: ~.

This shows that your nmcli command worked.

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Jerry Geis

Re: Question on nmcli on Ubuntu 20.04

On Fri, Dec 18, 2020 at 3:28 PM Tom H <[hidden email]> wrote:

On Fri, Dec 18, 2020 at 8:55 PM Jerry Geis <[hidden email]> wrote:
>
> Link 2 (eno1)
> Current Scopes: DNS
> DefaultRoute setting: yes
> LLMNR setting: yes
> MulticastDNS setting: no
> DNSOverTLS setting: no
> DNSSEC setting: no
> DNSSEC supported: no
> Current DNS Server: 192.168.1.14
> DNS Servers: 192.168.1.14
> DNS Domain: ~.

This shows that your nmcli command worked.

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Thanks - I was "expecting" to see it reflected in /etc/resolv.conf so I thought it wasn't working.

Jerry

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