[Tailscale] Can't connect VPS to local network? - eviltoast

I set up Headscale and Tailscale using Docker on a VPS, which I want to use as my public IPv4 and Reverse Proxy to route incoming traffic to my local network and e. g. my home server. I also set up Tailscale using Docker on my home server and connected both to my Headscale server.
I am able to ping on Tailscale container from the other and vice versa and set up –advertise-routes=192.168.178.0/24 on my home server as well as –accept-routes on my VPS, but I can’t ping local IP addresses from my VPS. What am I missing?
Both container are connected to the host network, I have opened UDP ports 41641 and 3478 on my VPS.

      • Shadow@lemmy.caEnglish
        2·
        8 months ago

        That should be all that’s required. Are you using ACLs? If so you need to provide access to the subnet router as well as a rule to the IP behind it

          • Shadow@lemmy.caEnglish
            2·
            8 months ago

            Can your nodes ping each other on the tailscale ips? Check tailscale status and make sure the nodes see each other listed there.

            Try tailscale ping 1.2.3.4 with the internal IP addresses and see what message it gives you.

            tailscale debug netmap is useful to make sure your clients are seeing the routes that headscale pushes.

            • Dataprolet@lemmy.dbzer0.comOPEnglish
              1·
              8 months ago

              Yes, both clients can tailscale ping each other and after doing so the status shows active; relay “ams”.

              Using tailcale ping 192.168.178.178 also works for some reason.

              Not sure what to do with the output of netmap.

              • Shadow@lemmy.caEnglish
                2·
                8 months ago

                Relay “ams” means you’re using tailscales DERP node in amsterdam, this is expected if you don’t have direct connectivity through your firewall. Since you opened the ports that’s unusual and worth looking into, but I’d worry about that after you get basic connectivity.

                So to confirm your behavior, you can tailscale ping each other fine and tailscale ping to the internal network. You cannot however ping from the OS to the remote internal network?

                Have you checked your routing tables to make sure the tailscale client added the route properly?

                Also have you checked your firewall rules? If you’re using ipfw or something, try just turning off iptables briefly and see if that lets you ping through.

                • Dataprolet@lemmy.dbzer0.comOPEnglish
                  1·
                  8 months ago

                  So to confirm your behavior, you can tailscale ping each other fine and tailscale ping to the internal network. You cannot however ping from the OS to the remote internal network?

                  Exactly.

                  Have you checked your routing tables to make sure the tailscale client added the route properly?

                  How do I do this? I use Headscale and headscale routes list shows the following:

                  ID | Machine | Prefix           | Advertised | Enabled | Primary
1  | server  | 0.0.0.0/0        | false      | false   | -
2  | server  | ::/0             | false      | false   | -
3  | server  | 192.168.178.0/24 | true       | true    | true

                  Also have you checked your firewall rules? If you’re using ipfw or something, try just turning off iptables briefly and see if that lets you ping through.

                  I’m not using a firewall, but the VPS is hosted on Hetzner, which has a firewall. But I already allowed UDP port 41641 and 41641. The wg0 rule is from the Wireguard setup I want to replace using Tailscale.

                  # iptables --list-rules
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
-N DOCKER
-N DOCKER-ISOLATION-STAGE-1
-N DOCKER-ISOLATION-STAGE-2
-N DOCKER-USER
-A INPUT -s 100.64.0.0/10 -j ACCEPT
-A FORWARD -j DOCKER-USER
-A FORWARD -j DOCKER-ISOLATION-STAGE-1
-A FORWARD -o docker0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -o docker0 -j DOCKER
-A FORWARD -i docker0 ! -o docker0 -j ACCEPT
-A FORWARD -i docker0 -o docker0 -j ACCEPT
-A FORWARD -i wg0 -j ACCEPT
-A DOCKER -d 172.17.0.3/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 443 -j ACCEPT
-A DOCKER -d 172.17.0.3/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 81 -j ACCEPT
-A DOCKER -d 172.17.0.3/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 80 -j ACCEPT
-A DOCKER -d 172.17.0.5/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 9090 -j ACCEPT
-A DOCKER -d 172.17.0.5/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 8080 -j ACCEPT
-A DOCKER -d 172.17.0.6/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 443 -j ACCEPT
-A DOCKER -d 172.17.0.2/32 ! -i docker0 -o docker0 -p tcp -m tcp --dport 9001 -j ACCEPT
-A DOCKER-ISOLATION-STAGE-1 -i docker0 ! -o docker0 -j DOCKER-ISOLATION-STAGE-2
-A DOCKER-ISOLATION-STAGE-1 -j RETURN
-A DOCKER-ISOLATION-STAGE-2 -o docker0 -j DROP
-A DOCKER-ISOLATION-STAGE-2 -j RETURN
-A DOCKER-USER -j RETURN
                  • Shadow@lemmy.caEnglish
                    2·
                    8 months ago

                    How do I do this?

                    Run ip route show table all

                    I would expect to see a line like:

                    192.168.178.0/24 dev tailscale0 table 52

                    Out of curiosity on a remote node do tcpdump -i tailscale0 -n icmp and then do a ping from the other side, does tcpdump see the icmp packets come in?