RUTX(14)+Tailscale dns problems

NETWORKING SOLUTIONS
1

When our rutx14 changes sim, either by command or by configuration it regularly loses the ability to resolve domain names and loses connection to the Tailscale network. Lan devices continue without any problem. This has happened many times even once when installing a package.

I have been ssh’ing to a server inside the lan, which also has Tailscale installed, to connect to the rutx14 locally to restart Tailscale.

Today I went to the site to try to debug it (the UPS died and the internal server was waiting for the password for the encrypted disk).


   Device:     RUTX14
   Kernel:     5.10.233
   Firmware:   RUTX_R_00.07.13.4
   Build:      4fa85bedfb8
   Build date: 2025-04-02 12:01:53

root@RUTX14:~# tailscale version
1.70.0
  go version: go1.22.5


root@RUTX14:~# ping -c1 google.com | grep time
ping: bad address 'google.com'

root@RUTX14:~# cat /tmp/resolv.conf.d/resolv.conf.auto 
# Interface mob1s1a1_4
nameserver 62.87.92.201
nameserver 212.166.167.71
root@RUTX14:~# cat /tmp/resolv.conf
search lan
nameserver 127.0.0.1
nameserver ::1

root@RUTX14:~# tailscale down && tailscale up

root@RUTX14:~# ping -c1 google.com | grep time
64 bytes from 172.217.168.174: seq=0 ttl=118 time=27.453 ms

root@RUTX14:~# cat /tmp/resolv.conf.d/resolv.conf.auto 
# Interface mob1s1a1_4
nameserver 62.87.92.201
nameserver 212.166.167.71
root@RUTX14:~# cat /tmp/resolv.conf
search lan
nameserver 127.0.0.1
nameserver ::1

How should I proceed? Any help appreciated.

3

Hello,

Apologies for the delay. Could you please confirm whether the issue you’ve described is still present when using the latest RutOS 7.14.2 firmware?

Additionally, for testing purposes, you could try adding global DNS nameservers via Tailscale’s admin panel and then running the following command on your RUTX14:

tailscale up --accept-dns=false

This would prevent Tailscale from modifying the device’s DNS settings and allow you to see if the connectivity issue persists after a SIM switch or Tailscale reconnect.

Let me know if the issue still persists.

Best regards,

4

Hi Martynas,

it hasn’t happened since the RUTX_R_00.07.14.2 update, even though the router has switched SIM 4 or 5 times.

If It happens again I will follow your advice, thank you for your time.

Gav

5

Hi there,

Thank you for the update. That’s great news! :slightly_smiling_face:

If it reoccurs again, then I’ll need to contact you privately through email for efficient troubleshooting.

Kind regards,

6

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