Incomplete MagicDNS from within K8s pod

SUPPORT QUESTIONS
1

Hey all,

I’m having trouble accessing non-local hosts using MagicDNS on TS running inside a K8s pod.

Here’s what I did:

  1. I followed this guide to deploy the K8s sidecar sample (sidecar.yaml).
  2. I verified that from other machines I can access the sidecar pod (curl http://nginx).
  3. I created a shell in the sidecar pod and pinged myself (ping nginx). It worked, so there’s some kind of MagicDNS resolution working here.
  4. Inside the same shell, I pinged another computer in my TS network (ping k8s-controller) and got ping: bad address.
  5. Inside the same shell, I directly pinged the IP address of the other computer and it worked fine (ping 100.71.27.47).

So inside my pod I appear to have network access to the rest of my TS network, but MagicDNS only works when resolving the localhost.
Any idea what’s wrong?

Thanks!

Tailscale 1.40.0.
K8s on K0s 1.26.3+k0s.0.

2

FYI I’ve cross posted to Reddit.