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Forums › LAN (ethernet/Wifi/routers/Bluetooth) › Port forwarding on Spark smart modem (VRV9517) using contact as an ISP
matt27427

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#304522 11-May-2023 15:53
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Hey all, I've port forwarded in the past without issue but this is the first time its given me trouble... I'm using contact as an ISP on their fibre plan and am attempting to forward port 25565 so friends can connect to a server i'm hosting. Below are the settings i'm using:

 

 

 

 

 

Port checker says that the port is open and i've tried toggling the firewall to see if that fixes it. 

 

I'd appreciate if anyone had advice (past changing my isp or to simply not port forward)

 

 

 

Thanks!

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michaelmurfy
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  #3075050 11-May-2023 15:57
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Contact have CG-NAT so you won't be able to port forward.

 

CG-NAT means you do not have a public IP address.

 

Instead, you could use Tailscale https://tailscale.com/ with named access or what I personally use for playing online games (retro ones) is Zerotier (https://www.zerotier.com/)




Michael Murphy | https://murfy.nz
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matt27427

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  #3075051 11-May-2023 15:59
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Hey! thanks for the quick reply. I actually just asked contact whether port forwarding was possible on their networks and whether they used cgnat and they explicitly said yes, portforwarding is possible and no they dont use cgnat...

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  #3075052 11-May-2023 16:01
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matt27427:

 

Hey! thanks for the quick reply. I actually just asked contact whether port forwarding was possible on their networks and whether they used cgnat and they explicitly said yes, portforwarding is possible and no they dont use cgnat...

 

 

Welcome to tier one customer service......




Referral Link Quic

 

Free Setup use R502152EQH6OK on check out

 

 



michaelmurfy
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  #3075249 11-May-2023 21:15
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Compare the IP address of your router to what is displayed on https://4.icanhazip.com and that’ll tell you straight away. If they’re different then CG-NAT.




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nztim
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  #3075252 11-May-2023 21:30
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if you WAN IP is 100.xx.xx.,xx it is CG-NAT




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michaelmurfy
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  #3075253 11-May-2023 21:31
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@nztim unless if you’re with MyRepublic when you get a 192.168.xxx.xxx IP which did screw things up a few times.




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nztim
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  #3075255 11-May-2023 21:39
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MR is just special :)

On another note I installed Starlink for a client a few days ago and forgot to put the Starlink modem into Bypass mode alas it gave a DHCP lease to the SonicWALL with the same 192.168.1 network as the LAN. Things didn’t end well.




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Wombat1
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  #3075271 11-May-2023 23:28
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If you stuck with CGNAT, use ngrok. It works well.

 

https://ngrok.com/docs/getting-started/

michaelmurfy
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  #3075272 11-May-2023 23:51
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@Wombat1 Check out Cloudflare Tunnel too. It is truly free and works incredibly well.




Michael Murphy | https://murfy.nz
Referral Links: Quic Broadband (use R122101E7CV7Q for free setup)

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