Arch Linux

Strangiato

Member

Registered: 2020-01-10

Posts: 382

[Solved] Ethernet without connectivity to internet. Wi-Fi works.

Hi
I follow these steps:

1. I connect to wi-fi network
2. while the laptop is connected to wi-fi, I connect a network cable to ethernet adapter

After these steps, the ethernet cable is detected, airplaine mode of the laptop
is activated, but I can't load any website and ping command fails.
However, local network has connectivity, I can mount samba shares.

I connect to wi-fi using network manager + iwd + dns client of iwd.
I also use network manager to connect to wired network.

My wired network has connectivity to internet if airplaine mode is activated
before ethernet cable is connected.

I use this dispacher to automatically toggle wireless depending on LAN cable being plugged in

https://wiki.archlinux.org/title/Networ … plugged_in

How to fix the lack of connectivity to internet when the ethernet cable is connected while my laptop is connected to wi-fi?

Thanks for reading.

Last edited by Strangiato (2022-04-17 17:47:46)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,772

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

What are the output of ip route with WiFi, With non-working wired, and with working  wired?  Also, for context, what are the output of ip addr for those states?

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

Strangiato

Member

Registered: 2020-01-10

Posts: 382

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

ip route with wi-fi:

default via 192.168.0.1 dev wlan0 proto dhcp metric 304 
default via 192.168.0.1 dev wlan0 proto dhcp metric 600 
192.168.0.0/24 dev wlan0 proto dhcp scope link src 192.168.0.14 
192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.14 metric 600

ip addr with wi-fi:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 64:1c:67:62:de:27 brd ff:ff:ff:ff:ff:ff
4: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 0c:d2:92:b5:4e:33 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.14/24 scope global dynamic noprefixroute wlan0
       valid_lft 2423sec preferred_lft 2423sec

ip route with non-working wired:

default via 192.168.0.1 dev enp1s0 proto dhcp metric 100 
192.168.0.0/24 dev enp1s0 proto kernel scope link src 192.168.0.15 metric 100 

ip addr with non-working wired:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 64:1c:67:62:de:27 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.15/24 brd 192.168.0.255 scope global dynamic noprefixroute enp1s0
       valid_lft 3460sec preferred_lft 3460sec
4: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 0c:d2:92:b5:4e:33 brd ff:ff:ff:ff:ff:ff
 

ip route with working wired:

 default via 192.168.0.1 dev enp1s0 proto dhcp metric 100 
192.168.0.0/24 dev enp1s0 proto kernel scope link src 192.168.0.15 metric 100 

ip addr with working wired:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 64:1c:67:62:de:27 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.15/24 brd 192.168.0.255 scope global dynamic noprefixroute enp1s0
       valid_lft 3541sec preferred_lft 3541sec
4: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 0c:d2:92:b5:4e:33 brd ff:ff:ff:ff:ff:ff

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,772

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

Not what I thought it was.
When you have a non-working wired, can you ping 8.8.8.8 ?

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

Strangiato

Member

Registered: 2020-01-10

Posts: 382

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

Not what I thought it was.
When you have a non-working wired, can you ping 8.8.8.8 ?

yes, I can.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,772

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

So, it is a DNS problem.   Your IP address and routes are getting set up.

I am not your man for DNS issues, I hope others will pop in here.

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

-thc

Member

Registered: 2017-03-15

Posts: 497

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

*Popping in*

iwd uses systemd-resolved by default (if not configured) or resolvconf (if configured to do so).

NetworkManager can be configured to cooperate with both of them.

In case of systemd-resolved make sure that it is running properly (using resolvectl)
and that /etc/resolv.conf is a symlink to /run/systemd/resolve/stub-resolv.conf.

Strangiato

Member

Registered: 2020-01-10

Posts: 382

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

Thank you all for the help. Here is my /etc/iwd/main.conf file:

[General]
EnableNetworkConfiguration=true
[Network]
NameResolvingService=resolvconf

-thc

Member

Registered: 2017-03-15

Posts: 497

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

In case of openresolv/resolvconf add a configuration file to NetworkManager:

/etc/NetworkManager/conf.d/rc-manager.conf

with this statement:

[main]
rc-manager=resolvconf

Strangiato

Member

Registered: 2020-01-10

Posts: 382

Re: [Solved] Ethernet without connectivity to internet. Wi-Fi works.

In case of openresolv/resolvconf add a configuration file to NetworkManager:

/etc/NetworkManager/conf.d/rc-manager.conf

with this statement:

[main]
rc-manager=resolvconf

Followed your instructions, restarted NetworkManager service, now the problem is solved! Thank you very much.