Arch Linux

honeyplease

Member

Registered: 2013-09-07

Posts: 33

[SOLVED] Wifi connected, no internet after update

I updated yesterday and wifi/ethernet is connecting but no internet. Anyone experiencing a similar issue?

I am aware there are a bunch of posts about this:

* My device is up
* I can ping 8.8.8.8
* Ping google does not work.
* Tried changing dhcp client from internal to another one in [main] chunk of conf file.
* iw dev my_dev link shows dev is being recognized (obviously I think as it is UP)
* Network manager is active/enabled, sees connections and actually connects, no internet (same with ethernet).

I know very little about networking but could this be  DNS issue? Would running this work (not hope atm):

systemctl enable dhcpcd@eth0.service
systemctl start dhcpcd@eth0.service

(and for wifi too?)

This seems to be a usual problem but I'm a bit lost right now how else to proceed.

Thanks,

Last edited by honeyplease (2018-09-25 23:56:28)

Koatao

Member

Registered: 2018-08-30

Posts: 98

Re: [SOLVED] Wifi connected, no internet after update

Hello,

* My device is up
* I can ping 8.8.8.8
* Ping google does not work.

If you ping a WAN network address, you have «internet», and if you can't ping a domain, it usually means DNS request aint working.
So look that way

EDIT: Okey, Im gonna help. a little bit more.
From what I understood, you are using NetworkManager. I know very little about it. But NetworkManager overwrite /etc/resolv.conf file by default. This file is used by your system for Domain Name resolution.
Standard procedure with DHCP server is to advertise the gateway as DNS server. So it kinda works like this (very simplified):

- NetworkManager making request to DHCP server
- DHCP server responding to NetworkManager, giving all info needed and more (like DNS server to be used)
- NetworkManager is setting up your network configuration with those info

https://wiki.archlinux.org/index.php/Do … main_names

Last edited by Koatao (2018-09-25 21:10:39)

seth

Member

Registered: 2012-09-03

Posts: 61,216

Re: [SOLVED] Wifi connected, no internet after update

output of

systemctl list-unit-files --state=enabled

If systemd-resolved is on the list, see https://bbs.archlinux.org/viewtopic.php?pid=1808727

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honeyplease

Member

Registered: 2013-09-07

Posts: 33

Re: [SOLVED] Wifi connected, no internet after update

output of

systemctl list-unit-files --state=enabled

If systemd-resolved is on the list, see https://bbs.archlinux.org/viewtopic.php?pid=1808727

Yup, this was it.

For anyone with the same issue, I solved mine with one of the solutions in that post: in my /etc/systemd/resolved.conf I added:

DNS=8.8.8.8 8.8.4.4

and uncommented

DNSSEC=allow-downgrade

@Koatao thanks

seth

Member

Registered: 2012-09-03

Posts: 61,216

Re: [SOLVED] Wifi connected, no internet after update

Did you actively configure NM to use resolved or is this now the default resolver??
Please ensure to read https://wiki.archlinux.org/index.php/Systemd-resolved - there more pitfalls than this apparent bug.

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