Shared node DNS issue

[JayWStapleton]

What is the issue?

When user A has nodes shared with user B, and user B has a node shared with user A, MagicDNS does not resolve for the shared nodes in either direction.

Also, shared nodes did not show up in tailscale status

Steps to reproduce

jay@nautilus-debian:~$ tailscale status
100.89.187.98   nautilus-deb-test    jstaplet@    linux   -
100.117.133.12  ip-10-0-0-114.domain1.beta.tailscale.net jay@         linux   -

Then shared nautilus-deb-test back to domain1, then

jay@nautilus-debian:~$ tailscale status
100.89.187.98   nautilus-deb-test    jstaplet@    linux   -
jay@nautilus-debian:~$ tailscale ping 100.117.133.12
pong from device-of-shared-to-user (100.117.133.12) via DERP(ord) in 137ms
pong from device-of-shared-to-user (100.117.133.12) via DERP(ord) in 51ms

Remove the share to from nautilus-deb-test, and the node shared from domain1 are once again visible in tailscale status

This does not happen for every bidirectional sharing.

Are there any recent changes that introduced the issue?

No response

OS

No response

OS version

No response

Tailscale version

1.20, 1.19, 1.18 tested

Bug report

BUG-2492d4547400cf7c4d2bf08350f6bcc990cf998d12390462fefd1f1c3c269eb5-20220119185350Z-15ac31a90257d9d0

[JayWStapleton]

BUG-2492d4547400cf7c4d2bf08350f6bcc990cf998d12390462fefd1f1c3c269eb5-20220119194536Z-771d220a6437de19 domain1

BUG-993dda06e35b03cc437fc71494d430affa92cded991e38e3903637d62894ada4-20220119194524Z-9b809bad0e3c5f14
domain2

[bradfitz]

Dup of #3756?

[JayWStapleton]

Might be the same root cause. I tested on linux systems. The initial notification came from a user with Windows on both nodes. This only seems to appear where there are nodes shared both ways between two tailnets.

[Delikt]

Update: Nevermind after i restart one Maschine i can ping the other one and i had Portmaster running (https://github.com/Safing/portmaster).

So i can now ping the Device but the output of tailscale status is still just 1 Device

---

i have the same issue, after i share bi-directional the second device between two User Accounts, the output of tailscale status is just 1 Device (the own one) but before while i just shared the first device tailscale status shows me all two devices

Kernel: x86_64 Linux 5.13.0-44-generic
OS: Linux Mint 20.3 Una
Tailscale version: 1.24.2 (on both nodes the same specification)

i also cant ping the devices with the CLI Ping Command (also traceroute didn't find a route)

i only got a response from the command tailscale ping anything else wasnt possible

i set on both machines the Firewall rules allowed to make sure there isn't a Problem

[mihaip]

This is now fixed (on the server side, so a client update is not required, though they will need to wait until the next netmap update to pick up the additional DNS route for beta.tailscale.net).