No internet on boot: resolvectl + dhclient commands to solve on each boot. why?

0x3phemeralsoul · March 1, 2023, 12:59pm

Since a couple of days ago when I start from suspension or boot my ubuntu laptop I have no DNS, no internet connection, I can only ping routes defined in /etc/hosts like a localnetwork server.

I am forced to:
resolvectl revert 3
resolvectl revert 4
sudo dhclient wlp0s20f3

After that, the WIFI symbol in the status bar comes up (before the commands there is always a network symbol, but I have no ethernet cable connected). and After the commands everything works.

BTW: revert 3 and 4 are just: Link 3 (ipv6leakintrf0) and Link 4 (pvpnksintrf0)

Raj · March 2, 2023, 12:44am

Check your netplan config.

ls /etc/netplan/

I have file named 01-network-manager-all.yaml in that dir. Can you paste contains of it?

cat /etc/netplan/01-network-manager-all.yaml

0x3phemeralsoul · March 2, 2023, 2:18pm

Here is the contents of the only file "01-network-manager-all.yaml
" in the directory:

network:
  version: 2
  renderer: NetworkManager

nixcraft · March 2, 2023, 6:51pm

Make sure the NetworkManager service is enabled at boot time. Here is how to check:

systemctl is-enabled NetworkManager

Is it disabled? If so, enable it:

sudo systemctl enable NetworkManager

Next, make sure your wifi connection is listed here:

nmcli -p device
nmcli device status

# Is wifi enabled?
nmcli general status

# Viewing all connections
nmcli connection show

To view the available wifi access points and SSID:

nmcli dev wifi list

Here is how to connect to a password-protected wifi network:

nmcli --ask device wifi connect "YOUR_SSID_HERE"

You can see WiFi auto connect and NetworkManger management status:

nmcli -p -f general,wifi-properties device show YOUR_WIFI_DEVICE_NAME

# To find your WIFI device name run
nmcli -p device

# Then see properties (say device name is wlp82s0)
nmcli -p -f general,wifi-properties device show wlp82s0
nmcli -p device show wlp82s0 | more

Make sure the following two are enabled/yes:

GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes

nixcraft · March 2, 2023, 6:52pm

There is a GUI too if you are using Desktop. Just open Settings and WiFi. Make sure Wi-Fi is enabled if using GUI:

0x3phemeralsoul · March 8, 2023, 1:35pm

it is in fact enabled.

DEVICE             TYPE      STATE         CONNECTION               
------------------------------------------------------------------------------------------
wlp0s20f3          wifi      connected     EasyBox-2EB344 1         
ipv6leakintrf0     dummy     connected     pvpn-ipv6leak-protection 
pvpnksintrf0       dummy     connected     pvpn-killswitch          
br-e2a94ac4df51    bridge    connected     br-e2a94ac4df51          
docker0            bridge    connected     docker0                  
p2p-dev-wlp0s20f3  wifi-p2p  disconnected  --                       
veth5591bfe        ethernet  unmanaged     --                       
veth9bb9c0c        ethernet  unmanaged     --                       
lo                 loopback  unmanaged     --

STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN
connected full enabled enabled enabled enabled

===============================================================================
                          Device details (wlp0s20f3)
===============================================================================
GENERAL.DEVICE:                         wlp0s20f3
GENERAL.TYPE:                           wifi
GENERAL.NM-TYPE:                        NMDeviceWifi
GENERAL.DBUS-PATH:                      /org/freedesktop/NetworkManager/Devices/2
GENERAL.VENDOR:                         Intel Corporation
GENERAL.PRODUCT:                        --
GENERAL.DRIVER:                         iwlwifi
GENERAL.DRIVER-VERSION:                 5.14.0-1057-oem
GENERAL.FIRMWARE-VERSION:               63.c04f3485.0 QuZ-a0-hr-b0-63.u
GENERAL.HWADDR:                         7C:21:4A:A3:47:C4
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.REASON:                         0 (No reason given)
GENERAL.IP4-CONNECTIVITY:               4 (full)
GENERAL.IP6-CONNECTIVITY:               4 (full)
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:14.3/net/wlp0s20f3
GENERAL.IP-IFACE:                       wlp0s20f3
GENERAL.IS-SOFTWARE:                    no
GENERAL.NM-MANAGED:                     yes
GENERAL.AUTOCONNECT:                    yes
GENERAL.FIRMWARE-MISSING:               no
GENERAL.NM-PLUGIN-MISSING:              no
GENERAL.PHYS-PORT-ID:                   --
GENERAL.CONNECTION:                     EasyBox-2EB344 1
GENERAL.CON-UUID:                       8d5d0bb0-11ef-4ee5-943f-701cf9dd78fe
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/20
GENERAL.METERED:                        no (guessed)
-------------------------------------------------------------------------------
WIFI-PROPERTIES.WEP:                    yes
WIFI-PROPERTIES.WPA:                    yes
WIFI-PROPERTIES.WPA2:                   yes
WIFI-PROPERTIES.TKIP:                   yes
WIFI-PROPERTIES.CCMP:                   yes
WIFI-PROPERTIES.AP:                     yes
WIFI-PROPERTIES.ADHOC:                  yes
WIFI-PROPERTIES.2GHZ:                   yes
WIFI-PROPERTIES.5GHZ:                   yes
WIFI-PROPERTIES.MESH:                   no
WIFI-PROPERTIES.IBSS-RSN:               yes
-------------------------------------------------------------------------------

tomboi · March 9, 2023, 1:08am

Set wlp0s20f3 method to auto for DHCP (you need remove any static IP if you have one; otherwise you will end up getting both DHCP and static IPs):

nmcli device modify wlp0s20f3  ipv4.method auto
nmcli device modify wlp0s20f3  ipv6.method auto
nmcli device modify wlp0s20f3 connection.autoconnect yes
nmcli networking off
nmcli networking on
nmcli device show wlp0s20f3

0x3phemeralsoul · March 9, 2023, 3:04pm

Sadly that hasn’t worked.

I got this:

GENERAL.DEVICE:                         wlp0s20f3                                                                                                                                             
GENERAL.TYPE:                           wifi                                                                                                                                                  
GENERAL.HWADDR:                         7C:21:4A:A3:47:C4                                                                                                                                     
GENERAL.MTU:                            1500                                                                                                                                                  
GENERAL.STATE:                          100 (connected)                                                                                                                                       
GENERAL.CONNECTION:                     EasyBox-2EB344 1                                                                                                                                      
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/9                                                                                                    
IP4.ADDRESS[1]:                         10.0.0.66/24                                                                                                                                          
IP4.GATEWAY:                            10.0.0.1                                                                                                                                              
IP4.ROUTE[1]:                           dst = 0.0.0.0/0, nh = 10.0.0.1, mt = 600                                                                                                              
IP4.ROUTE[2]:                           dst = 10.0.0.0/24, nh = 0.0.0.0, mt = 600                                                                                                             
IP4.DNS[1]:                             8.8.8.8                                                                                                                                               
IP6.ADDRESS[1]:                         fe80::7e21:4aff:fea3:47c4/64                                                                                                                          
IP6.GATEWAY:                            --                                                                                                                                                    
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 256

but the problem is not about connecting to the WIFI only (which seems to work in the background always for some reason, cuz I can connect to local server in the network that I have added to hosts file)

the main issue seems to DNS config. For example, after the last set of commands provided I now have to do

resolvectl revert 7
resovelctl rever 8

cuz the 2 connections have this:

GENERAL.DEVICE:                         wlp0s20f3                                                                                                                                             
GENERAL.TYPE:                           wifi                                                                                                                                                  
GENERAL.HWADDR:                         7C:21:4A:A3:47:C4                                                                                                                                     
GENERAL.MTU:                            1500                                                                                                                                                  
GENERAL.STATE:                          100 (connected)                                                                                                                                       
GENERAL.CONNECTION:                     EasyBox-2EB344 1                                                                                                                                      
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/9                                                                                                    
IP4.ADDRESS[1]:                         10.0.0.66/24                                                                                                                                          
IP4.GATEWAY:                            10.0.0.1                                                                                                                                              
IP4.ROUTE[1]:                           dst = 0.0.0.0/0, nh = 10.0.0.1, mt = 600                                                                                                              
IP4.ROUTE[2]:                           dst = 10.0.0.0/24, nh = 0.0.0.0, mt = 600                                                                                                             
IP4.DNS[1]:                             8.8.8.8                                                                                                                                               
IP6.ADDRESS[1]:                         fe80::7e21:4aff:fea3:47c4/64                                                                                                                          
IP6.GATEWAY:                            --                                                                                                                                                    
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 256

and after the resolvectl commands I get this:

Link 8 (pvpnksintrf0)
      Current Scopes: none
DefaultRoute setting: no  
       LLMNR setting: yes 
MulticastDNS setting: no  
  DNSOverTLS setting: no  
      DNSSEC setting: no  
    DNSSEC supported: no  

Link 7 (ipv6leakintrf0)
      Current Scopes: none
DefaultRoute setting: no  
       LLMNR setting: yes 
MulticastDNS setting: no  
  DNSOverTLS setting: no  
      DNSSEC setting: no  
    DNSSEC supported: no

afterwards I stil lhave to do: sudo dhclient w3... to get it all working.

Thanks a lot for the support you are all providing.

nixcraft · March 10, 2023, 6:51am

Do you have dns=none set anywhere in /etc/NetworkManager/ config file?

sudo grep -Ri 'dns=' /etc/NetworkManager/

Also what does the following command prints? Is is symlink?

 ls -l /etc/resolv.conf

0x3phemeralsoul · March 10, 2023, 8:55am

cat /etc/NetworkManager/NetworkManager.conf

delivers this:

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

[device]
wifi.scan-rand-mac-address=no

ls -l /etc/resolv.conf
delivers this:
lrwxrwxrwx 1 root root 39 abr 4 2022 /etc/resolv.conf → …/run/systemd/resolve/stub-resolv.conf

Contents of resolv.conf are:

# 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

tomboi · March 10, 2023, 6:55pm

This will tell you more about those DNS issues

systemd-resolve --status

Also the config file is /etc/systemd/resolved.conf

cat /etc/systemd/resolved.conf
sudo nano /etc/systemd/resolved.conf

Set DNS:

[Resolve]
DNS=8.8.4.4 8.8.8.8 2001:4860:4860::8888

Restart it:

sudo systemctl restart systemd-resolved
sudo systemctl status systemd-resolved
systemd-resolve --status
cat /etc/resolv.conf