No tailscale interface on UDM SE about tailscale-udm HOT 3 CLOSED

Hi @dsbaars, can you try running tailscale ping and let me know whether that works? Something else to try is opening http://<UDM Tailscale IP> in your browser to see whether you can access the webpage.

(You'll find this at /mnt/data/tailscale/tailscale ping on the UDM).

Tailscale on the UDM runs in usermode and doesn't create a new network interface, so you won't find it in the ip addr output. Instead, you'll need to use the tailscale command line tool to do all of your troubleshooting, including using tailscale ping, tailscale status and tailscale netcheck.

If you're still seeing failures after trying the above, please can you include the output of tailscale netcheck and we can try and loop the folks from the Tailscale team in to debug this.

from tailscale-udm.

Thanks @notheotherben that was not clear to me from the README.

tailscale ping

✅ This works to the UDM and from the UDM

http://

❌ Does not work from the network "behind" the UDM.
ℹ️ When I install tailscale client on one of the computers "behind" the UDM it is reachable.
But my idea of putting this tailscale client on the UDM is so that I don't need to put it on individual clients in the same subnet anymore.

tailscale netcheck

Looks good to me:

Report:
	* UDP: true
	* IPv4: yes, **HIDDEN**
	* IPv6: yes, **HIDDEN**
	* MappingVariesByDestIP: false
	* HairPinning: true
	* PortMapping:
	* Nearest DERP: London
	* DERP latency:
		- lhr: 27.7ms  (London)
		- fra: 31ms    (Frankfurt)
		- nyc: 107ms   (New York City)
		- ord: 118.3ms (Chicago)
		- dfw: 136.1ms (Dallas)
		- blr: 153.3ms (Bangalore)
		- sfo: 166.1ms (San Francisco)
		- sea: 173.3ms (Seattle)
		- sao: 233.3ms (São Paulo)
		- tok: 244ms   (Tokyo)
		- sin: 262.2ms (Singapore)
		- syd: 312.8ms (Sydney)

I guess I need to put a static route to the tailscale network manually?
The --advertise-routes works, but I'd like it too work the other direction as well ;)

from tailscale-udm.

I see, so you're looking to configure your network such that the UDM provides access to Tailnet IPs for all devices on your local network? Makes sense, however I don't know what would be entailed in setting that up and making it work. As I understand it, the way that Tailscale's subnet routers work is inherently simplex:

Subnet routers act as a gateway, relaying traffic from your Tailscale network onto your physical subnet.

I'd reach out to the folks over on tailscale/tailscale to find out whether this is a supported use case.

from tailscale-udm.