I’m in the UK and considering switching my Internet Service provider. I currently have a static public IP address (v4), however if I move it would become a dynamic IP address. I run Roon from a Synology NAS server currently, and use Roon ARC on the go. Am I likely to face any issues accessing my server via Roon ARC if I move to a dynamic public IP? Would I need to adjust any settings in Roon?
Provided that the new ISP does indeed provide a true public IP address (dynamic or otherwise), you should have no issues. If , however, they provide an IP address using CG-NAT which, while dynamic, is not a true public IP address then you will not be able to use port forwarding.
Assuming, the new ISP is going to provide you with a public IP address then there will probably be no changes required in Roon itself.
The one thing that you will have to watch is, if, associated with the change of ISP, you are also going to change routers. In this case, it is entirely possible that your new router will, by default, be set to manage a different subnet to your current router. This, in itself, is not a problem but if you have any devices on your network set to use a static (local) IP address rather than obtaining one from DHCP, you should change this before swapping out the routers otherwise those devices may become unreachable.
You have two possibilities:
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Change the network settings of all devices that are configured for static ip address allocation to use DHCP instead. Then they will be able to use DHCP to get a dynamic ip address in the new subnet and thus reachable.
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Change the LAN settings on your new router to use the same subnet (IPv4 address and netmask) as your old router and make sure that the DHCP address pool is setup to exclude the ip addresses of the device(s) with static IP addresses.
Again, if using a new router, there is another possible complication. If you are currently using uPNP to manage the port forwarding required by your Roon Server in order to support ARC, there is the possibility (hopefully remote) that the new router will not offer a uPNP service - at least not one that works with Roon Server. If this turns out to be the case, then you will have to manually configure a port forwarding rule.
If you are using a full fibre (FTTP) service (with an ONT on wall connecting to the router using Ethernet), and you are currently using your own router, then you should be able to continue to use the current router by just changing the WAN settings to match those required by the new ISP (assuming you can find out what these are). If you do this, then everything else should remain the same and you should be good to go.
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Thanks so much for the response. I’m changing from PlusNet to EE and I believe it is a regular dynamic IP and not CG-NAT (although I’m not 100% on that). It’s still going to be 900gb FTTP and my router will be staying the same. Sounds like it should all be fine.
I’m pretty sure EE does use CGNAT, and you’ll need to contact them and request a static IP address. They may charge for this. Alternatively, use Tailscale instead of port forwarding.
I think EE’s use of CG-NAT is a little complicated:
EE Mobile uses CG-NAT
The original EE broadband did, I believe, use CG-NAT.
However, for the past year or so, BT have been branding their broadband service as EE and this, as far as I know, does not use CG-NAT. I believe all new EE connections are on the new, non-CG-NAT service.
Possibly, but the OP is going for FTTP, and I’ve read mixed reports from end users. However, that could be down to users not understanding what package they are on.
I was referring to the FTTP service since the OP explicitly stated that they would be opting for the 900Mbps service. I was using BT FTTP at the time that they started rebranding as EE (and started trying to get everyone to migrate to the rebranded service).
I also found an EE help article explaining how to setup up port forwarding (although this article does not state which service(s) it applies to (or not):
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Ah ok, this sounds like it has potential to go wrong. I might just stick with Plusnet to keep things simple. Thanks all.
Are there any EE users with a recent FTTP install having issues with ARC?