this post was submitted on 15 Jan 2025
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Looking for Help with Weird Connectivity Issues (lemmy.dbzer0.com)
submitted 3 days ago by Kraven_the_Hunter@lemmy.dbzer0.com to c/linux@lemmy.ml
16 comments fedilink hide all child comments
 

I'll preface this by saying that these issues are on a Surface Tablet that I've been using to play around with, so I haven't been too diligent in documenting what changes were made when.

I've got a Surface Go 2 tablet with the LTE modem that I installed Linux Mint onto several months ago. When I first made the switch, cellular connectivity seemed very "touch and go" but Wi-Fi had been solid.

At some point in time (roughly 6 months ago), I switched my home network to using Control D for DNS resolution for about 2 months until I decided it wasn't what I wanted and went back to my default setup which is a Unifi UCG Max gateway using the AdGuard public DNS servers coupled with the built-in ad blocking of the Unifi gateway. This feeds to a separate Wi-Fi mesh network in my home.

About a month ago I noticed that I could no longer reach internet locations on my tablet when connected to my home Wi-Fi network, but I could still access other computers on my LAN just fine, so Wi-Fi was working. Cellular connectivity seemed to have stopped working entirely even though I ran the "lte_modem_fix" that is on github and was seeing several bars of connectivity in the status bar.

Even though websites were inaccessible (Firefox gave me an error saying there was no network connection), in my attempt to try anything I found that I could visit the Control D website even though I stopped subscribing months ago.

On a lark I pulled up my Mullvad VPN app which I have an active subscription to and it let me connect to a server. As soon as I did this, ALL internet sites became available.

Next I took the tablet with me away from home, disabled Wi-Fi and activated the cellular network. Again the bars appeared but I couldn't access any sites. I loaded up Mullvad and was able to connect, after which I could reliably connect to all internet sites. Again, cellular connectivity was never 100% but Wi-Fi was.

How do I even begin troubleshooting and fixing this? Needing a VPN isn't the end of the world, but when at home it gets in the way of accessing local computers so I'd like to get to where the tablet works on Wi-Fi or cellular, with and without a VPN active.

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[–] data1701d@startrek.website 1 points 2 days ago (1 children)

I feel like I had a problem very much like this with Debian Testing on my Surface Go 1 (and I think my desktop too) a couple years back, and it turned out there was issues with /etc/nsswitch.conf. I can't remember exactly what I did, but this is the current contents of that file:

# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.

passwd:         files systemd
group:          files systemd
shadow:         files
gshadow:        files

hosts:          files mdns4_minimal [NOTFOUND=RETURN] dns myhostname
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis

Compare yours - maybe even post it so I can try to reproduce the issue on my machine. Anyhow, hope it helps, and good luck.

[–] Kraven_the_Hunter@lemmy.dbzer0.com 1 points 1 day ago (1 children)

My nsswitch.conf file looks identical to yours, so nothing to edit there.

I also looked at my resolv.conf and systemd\resolved.conf files.

resolv.conf is a symlink, but is the only file with anything un-commented in the file:

# This is /run/systemd/resolve/stub-resolv.conf managed by man:systemd-resolved(
8).
# Do not edit.
#
# This file might be symlinked as /etc/resolv.conf. If you're looking at
# /etc/resolv.conf and seeing this text, you have followed the symlink.
#
# 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 should typically 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
search .
[–] data1701d@startrek.website 1 points 1 day ago

Well, it was worth a shot.