DNS stops working when disconnecting PPTP VPN on desktop

Bug #1797415 reported by Will Cooke
This bug affects 3 people
Affects Status Importance Assigned to Milestone
systemd (Ubuntu)

Bug Description

On Cosmic I was testing some VPN setups. I created a PPTP VPN connection to my server.
Everything connected and worked as it should.

When I disconnect the VPN, DNS resolution stops working.

Looking at "systemd-resolve --status" shows that the correct DNS server is listed for the interface when the connection is torn down, and I can ping it. Doing a nslookup setting the server to the IP address shown in --status shows that DNS resolution is working correctly.

resolv.conf says nameserver

Restart resolved makes things work again.
(Also, restarting Network Manager makes it work again.)

Trying to ping a hostname from the cli when in the broken state yields zero output from resolved logs when in debug mode. Almost like it's not even hitting resolved, so this bug could very well be somewhere else.

I've checked, and I can ping and the default routes look OK, although there is a route to the VPN server left over.

I'm all out of ideas. Any ideas?

Revision history for this message
Will Cooke (willcooke) wrote :
Revision history for this message
Will Cooke (willcooke) wrote :
tags: added: rls-cc-incoming
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Emmanuel DA MOTA (vilain-mamuth) wrote :
Revision history for this message
Will Cooke (willcooke) wrote :

Yeah, I think so. Thanks.

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in systemd (Ubuntu):
status: New → Confirmed
Revision history for this message
Chris (cnizzardini) wrote :

This is happening for me as well.

Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic

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