Port forwarding minecraft server on ubuntu with Google domains DNS help

[Alexcalibur]

Hello, I am trying to setup a Minecraft server on ubuntu, and I am running into some issues in regards to port forwarding. I have an ISP supplied router, which I believe I have properly port forwarded it there. I have the TCP/UDP: 25565 and the ip 192.168.xxx.xxx, which is under the device tab.

 

I have bought a domain on google domains, which I have forwarding to the IP I would find under ipchicken

 

What more do I need to do? I am a bit lost and new to this. Reading online it looks like I need to do a bit more with the DNS but I am not sure. Help would really be appreciated!

[NelizMastr]

16 hours ago, Alexcalibur said:

Hello, I am trying to setup a Minecraft server on ubuntu, and I am running into some issues in regards to port forwarding. I have an ISP supplied router, which I believe I have properly port forwarded it there. I have the TCP/UDP: 25565 and the ip 192.168.xxx.xxx, which is under the device tab.

 

I have bought a domain on google domains, which I have forwarding to the IP I would find under ipchicken

 

What more do I need to do? I am a bit lost and new to this. Reading online it looks like I need to do a bit more with the DNS but I am not sure. Help would really be appreciated!

You need two IP addresses to make it work, and not be on CG-NAT.

 

You need:

 

1x WAN IP - this is your outside connection, to which you forward your DNS A-record i.e. minecraft.mydomain.com to 42.0.69.69.

1x LAN IP - this is what your port forward on your router points to i.e. 192.168.1.10, port 25565 TCP.

 

If your WAN IP (check with WhatsMyIP) is in a 10.x.x.x, 172.16.x.x or 192.168.x.x range, you're behind CG-NAT and you can't do port forwarding.

[Alexcalibur]

2 hours ago, NelizMastr said:

You need two IP addresses to make it work, and not be on CG-NAT.

 

You need:

 

1x WAN IP - this is your outside connection, to which you forward your DNS A-record i.e. minecraft.mydomain.com to 42.0.69.69.

1x LAN IP - this is what your port forward on your router points to i.e. 192.168.1.10, port 25565 TCP.

 

If your WAN IP (check with WhatsMyIP) is in a 10.x.x.x, 172.16.x.x or 192.168.x.x range, you're behind CG-NAT and you can't do port forwarding.

Okay, thank you! I will try this.

[Alexcalibur]

2 hours ago, NelizMastr said:

You need two IP addresses to make it work, and not be on CG-NAT.

 

You need:

 

1x WAN IP - this is your outside connection, to which you forward your DNS A-record i.e. minecraft.mydomain.com to 42.0.69.69.

1x LAN IP - this is what your port forward on your router points to i.e. 192.168.1.10, port 25565 TCP.

 

If your WAN IP (check with WhatsMyIP) is in a 10.x.x.x, 172.16.x.x or 192.168.x.x range, you're behind CG-NAT and you can't do port forwarding.

I think I understand this, but starting at google domains I have my DNS A-record labeled as mc.servername.com and it is pointing to my outside connection 162.xxx.xxx.xxx. I then have the ports TCP/UDP:25565 open on my router pointing to device 192.168.x.x. What more needs to be done?

[NelizMastr]

8 minutes ago, Alexcalibur said:

I think I understand this, but starting at google domains I have my DNS A-record labeled as mc.servername.com and it is pointing to my outside connection 162.xxx.xxx.xxx. I then have the ports TCP/UDP:25565 open on my router pointing to device 192.168.x.x. What more needs to be done?

That should be it. If you're using Windows as the server OS, check the Windows firewall and allow port 25565 tcp outbound and inbound.

[Alexcalibur]

1 minute ago, NelizMastr said:

That should be it. If you're using Windows as the server OS, check the Windows firewall and allow port 25565 tcp outbound and inbound.

I am using Ubuntu, which I am not familiar with. I still can't get a connection on my local machine whither either the IP 162.xxx.xxx.xxx or the mc.servername.com

[NelizMastr]

1 minute ago, Alexcalibur said:

I am using Ubuntu, which I am not familiar with. I still can't get a connection on my local machine whither either the IP 162.xxx.xxx.xxx or the mc.servername.com

your router might not support NAT loopback, so you won't be able to test it locally.

 

Try the open port tester at yougetsignal.com. If it reports port 25565 as open, others should be able to connect. You can then connect using the local IP.

You could also use your cellular connection on your phone to test connectivity.

[Alexcalibur]

21 minutes ago, NelizMastr said:

If it reports port 25565 as open, others should be able to connect.

It says that the port is closed, so that means that the point of error is at my router?

[NelizMastr]

18 minutes ago, Alexcalibur said:

It says that the port is closed, so that means that the point of error is at my router?

Probably, yes. Afaik the firewall in Ubuntu is off by default, although you could try sudo ufw disable to disable it.

By the way, the port will only report as open if there's something listening on that port, so your Minecraft server needs to be running.

 

Do you have an ISP modem with your own router or are you using just the ISP provided modem/router?

[RockSolid1106]

47 minutes ago, Alexcalibur said:

I am using Ubuntu, which I am not familiar with. I still can't get a connection on my local machine whither either the IP 162.xxx.xxx.xxx or the mc.servername.com

Do you have a firewall enabled by any chance? The most common one is UFW.

[Alexcalibur]

1 hour ago, NelizMastr said:

Afaik the firewall in Ubuntu is off by default

I I ran the command to turn it off originally, but I will run it again

1 hour ago, NelizMastr said:

Do you have an ISP modem with your own router or are you using just the ISP provided modem/router?

I am using the ISP modem/router. My ISP is AT&T and they claim that I can't use anything other than their provided modem/router, which may not be true but for the time being it is all I have time for. 

[Alexcalibur]

2 hours ago, LTTfan2006 said:

Do you have a firewall enabled by any chance? The most common one is UFW.

I ran the command quoted below so it should be disabled

 

2 hours ago, NelizMastr said:

sudo ufw disable

 

[Jarsky]

You can test if its router or server, by trying to connect to it on the local IP address yourself. 

 

If you can connect locally, then the server is configured correctly, and you need to look at your router/internet. 

 

If you can't connect locally, then check that the server is running

 

e.g....

ps aux | grep minecraft*.jar
netstat -ano | grep 25565
sudo ufw status

 

You can try to telnet to it from your Windows machine and see if the port is responding, make sure the telnet client is installed and from cmd run

telnet <server> 25565