Tailscale Subnet Routing Issue on RUTX11

Networking Solutions
1

Hi all,

I’m running into a routing issue with Tailscale on a Teltonika RUTX11 router after upgrading to firmware recently. The setup worked perfectly on pervious firmware revisions, but now fails to route traffic correctly.

Setup Overview:

  • Tailscale installed through package manager.

  • Advertised subnet: 10.0.0.0/24

  • LAN subnet: 192.168.0.0/24

  • iptables used to NAT traffic between Tailscale advertised subnet and LAN.

Symptoms:

  • Can access router from tailnet address, however cannot access through adverised subnet routing.

What I’ve tried:

  • Verified iptables NAT rules are still in place.

    • iptables -t nat -I PREROUTING -d ‘10.0.0.0/24’ -i tailscale0 -j NETMAP --to ‘192.168.0.0/24’
      iptables -t nat -I POSTROUTING -s ‘192.168.0.0/24’ -o tailscale0 -j NETMAP --to ‘10.0.0.0/24’
      iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

  • Enabled IP forwarding.

  • Confirmed subnet routes are advertised and approved in the Tailscale admin console.

  • Checked firewall zones and masquerading settings in the WebUI.

  • Verified software flow offloading is enabled.

  • ACL rules are in places

  • Tested same setup different firmware revisions and have found it works on 12.3

Questions:

  • Has anyone else experienced routing issues with Tailscale on firmware 17.1?

  • Are there new firewall or NAT settings that need to be adjusted?

  • Could the kernel update or other firmware changes be interfering with iptables NAT?

Any help or insights would be greatly appreciated!

Thanks

2

I have the same problem since version 17.1.

Accessing the RUT via Tailscale is still possible but subnets are no longer working.

(temp solution: use port forwarding)

4

Hello,

We apologize for any inconvenience this issue may have caused. I have forwarded it to our RnD team. If we need more information from you or once I have any updates, I will let you know.

Thank you for your patience.

Best regards,

1 Like
5

For further troubleshooting we will need to review troubleshoot files from your devices. Since it contains sensitive information, I have sent you a form to fill out. Once completed, I will contact you privately regarding this issue.
@JamesMartyn – please use “15277” as the ticket ID.
@phgerin – please use “15277-2” as the ticket ID.

Best regards,

6

We are having trouble with the latest release. Tailscale goes offline/online, and subnet routing is not working

7

Hello everyone,

The fix for the Tailscale subnet routing issue will be included in the upcoming 7.17.2 firmware release. Unfortunately, I don’t have an exact release date, but the firmware should be available soon.

We appreciate your patience and understanding.

Best regards,

8

Hello,

Firmware 7.17.2 is already available. Could you please check if the issue with Tailscale subnet routing is resolved after updating?

Thank you!

Best regards,

9

Thanks, it’s fixed for me !

11

Thanks, everything is working as expected now.

12

Hello @phgerin @JamesMartyn,

Good to hear that the issue is resolved!

Please feel free to post on the forum anytime if you have more questions or need further assistance.

Best regards,

13

Thanks again for quick support and resolution.

My only other query that also kind of relates to this is will the Tailscale package be updated? It currently sits at v1.70 and Tailscale is up to v1.86?

14

Hello,

It is possible to update Tailscale. One of our community users shared how they updated it here: RutOS firmware 7.17.1 + Tailscale (any post-1.70 version) = broken (The issue reported in that topic is already fixed in the 7.17.3 firmware version).

Best regards,