DNS randomly stops working on Ubuntu

Linux
1

I have this recurring issue where Magic DNS will randomly stop working on Ubuntu. Here are the last log lines:

> systemctl status tailscaled.service 
● tailscaled.service - Tailscale node agent
     Loaded: loaded (/lib/systemd/system/tailscaled.service; enabled; vendor preset: enabled)
     Active: active (running) since Mon 2021-05-31 16:02:45 PDT; 4h 54min ago
       Docs: https://tailscale.com/kb/
   Main PID: 1020 (tailscaled)
     Status: "Connected; skainsworth@gmail.com; 100.125.26.92 fd7a:115c:a1e0:ab12:4843:cd96:627d:1a5c"
      Tasks: 15 (limit: 14301)
     Memory: 31.4M
     CGroup: /system.slice/tailscaled.service
             └─1020 /usr/sbin/tailscaled --state=/var/lib/tailscale/tailscaled.state --socket=/run/tailscale/tailscaled.sock --port 41641

May 31 20:55:20 skainswo-X58A-UD3R tailscaled[1020]: monitor: RTM_DELROUTE: src=, dst=, gw=192.168.1.1, outif=2, table=254
May 31 20:55:20 skainswo-X58A-UD3R tailscaled[1020]: logtail: dialed "log.tailscale.io:443" in 32ms
May 31 20:55:20 skainswo-X58A-UD3R tailscaled[1020]: monitor: RTM_NEWROUTE: src=, dst=, gw=192.168.1.1, outif=2, table=254
May 31 20:55:20 skainswo-X58A-UD3R tailscaled[1020]: monitor: RTM_DELROUTE: src=, dst=, gw=192.168.1.1, outif=2, table=254
May 31 20:55:32 skainswo-X58A-UD3R tailscaled[1020]: netmap diff:
May 31 20:55:32 skainswo-X58A-UD3R tailscaled[1020]: - [FPOc0] d:59cfc3a78a75f3d8 D2 100.118.228.49 fd7a:115c:a1e0:ab12:4843:cd96:6276:e431/128 :    18.144.84.22:41641    172.31.5.175:41641      172.17.0.1:41641      172.19.0.1:41641
May 31 20:55:32 skainswo-X58A-UD3R tailscaled[1020]: + [FPOc0] d:5376df70c48d9d58 D2 100.118.228.49 fd7a:115c:a1e0:ab12:4843:cd96:6276:e431/128 :  54.183.106.211:41641    172.31.5.175:41641      172.19.0.1:41641      172.17.0.1:41641
May 31 20:55:32 skainswo-X58A-UD3R tailscaled[1020]: magicsock: node [FPOc0] changed discovery key from 59cfc3a78a75f3d8 to 5376df70c48d9d58
May 31 20:55:32 skainswo-X58A-UD3R tailscaled[1020]: wgengine: Reconfig: [FPOc0] changed from "59cfc3a78a75f3d85601484738911aa6c70e693c7aa9e386c7a9398be1c46178.disco.tailscale:12345" to "5376df70c48d9d5839ecddfbca6f1c09121755bbd154d104bff4a4073dfb6105.disco.tailscale:12345"
May 31 20:55:32 skainswo-X58A-UD3R tailscaled[1020]: wgengine: Reconfig: configuring userspace wireguard config (with 0/3 peers)

Running systemctl restart tailscaled.service seems to resolve the issue.

2

Btw, I’m running Ubuntu 20.04.2 LTS and

> tailscale --version
1.8.5
  tailscale commit: 118cf0cd75f92bbe3d994a5b1587c9ea3553221b
  other commit: c6fd9c9d5657e82c2d7888804ebce0e8bd6a4556
  go version: go1.16.4-ts1b677aa
3

Can you please run “tailscale bugreport” when the issue occurs and share the output of it. so we can look at the logs accordingly?

1 Like
4

Can you please share the output of NetworkManager -V ?

Sent from Front

5

Ok, will do!

> NetworkManager -V
1.22.10
6

Hello,

Looks like we hit this issue too and it’s fixed in an unstable build.You can try an unstable build of Tailscale and verify that it fixes your issue too.

7

Im facing the same issue with Ubuntu 20.04 and using the unstable release (1.9.138
) sadly only shortly helped me and it happened again after like an hour. Any ideas?

8

Hello,

This issue tracked with https://github.com/tailscale/tailscale/issues/1699. Please subscribe to it for future updates.

Sent from Front