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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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real strange DNS issues, help! (lemmy.nz)

submitted 11 months ago by [email protected] to c/[email protected]

4 comments fedilink hide all child comments

I have to post this on my phone

Logged out, logged in again, cannot get web pages. Can ping to ips, cannot resolve names with ping. Can resolve names with nslookup. Browsing doesn't work obviously but I can get to remote ips like repo locations.

???

REALLY seems like DNS but DNS is working with nslookup and I can change the nameserver in etc/resolv.conf and see nslookup using different nameserver but still no dice when using ping/browser

Any ideas??

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[–] [email protected] 8 points 11 months ago* (last edited 11 months ago) (3 children)

Ok figured out the origin,

I reconnected protonvpn and we are back in business. What is going on here? Why is my DNS being blocked when protonvpn is off? This is after multiple restarts.

I can reliably reproduce this issue if I logout without disconnecting protonvpn.

Really curious to find out the cause for this!

[–] luc891 18 points 11 months ago

Did you activate protonvpn killswitch ?

[–] [email protected] 10 points 11 months ago

It's probably leaving around DNS entries that only works while on the VPN, and depending which program is making the DNS query, it may or may not fall back to a public server.

[–] [email protected] 2 points 11 months ago

Are you using /etc/resolv.conf?

I don't use proton but I found with tailscale it's much more stable to use systemd-resolved because it doesn't overwrite resolv.conf. I don't know if this is the case with proton as I don't know how it treats different resolvers but I would look into it.