Synology NAS - Cellular Router
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Discussion

Ham_and_Jam

Original Poster:

3,347 posts

119 months

Wednesday 3rd December 2025
quotequote all
Will a Synology NAS work on a local network when plugged into a router running 4g / 5g.

Basically I’m moving, and lots of stuff is on my NAS that I need to use on a daily basis for work.

It’s unlikely that in the short term I will have broadband at the new house as its a rip out job, so will be living nearby in temporary accommodation that won’t have it.

I do have a good 4G router that I use regularly and it has 4 x ethernet ports out. Could I plug in and play?

Is there much extra configuration to do, or will the existing configured laptop / PC just find it on the new network?


GiantEnemyCrab

7,921 posts

225 months

Wednesday 3rd December 2025
quotequote all
It is very likely to work (assuming its all DHCP and no static IPs or similar).

The fact that it is 4g connection upstream doesn't really affect much on the LAN-side.

(assuming you mean accessing the NAS from at home, rather than remotely). If you mean remotely, it will probably still work via STUN / UDP hole punch or something. Do you recall setting up a 'port forward' on your current router? Some older NAS's need this but not needed anywhere near as much these days.

Ham_and_Jam

Original Poster:

3,347 posts

119 months

Wednesday 3rd December 2025
quotequote all
Yeah I just need local network access. I do occasionally use remote access at the moment, but thats not essential short term.

This is the router -

https://www.tp-link.com/uk/home-networking/5g-4g-r...

I can’t remember much about setting it up, but to be honest I’m not a tech wizard and port forwarding doesn’t sound like something I’d do.

I thought it should work, but sometimes things don t always play nicely together.

Griffith4ever

6,294 posts

57 months

Thursday 4th December 2025
quotequote all
Where the router gets it's wan (internet)from is neither here nor there , devices on your Lan are the same, regardless of router. All you need concern yourself with is making sure it is on the same internal subnet if you want to give it the same address, even then it doesn't matter.

Your current dhcp pool might be 192.168.0.1 to 0.250, and your NAS is 192.168.0.51 . If your new router has a different pool, say 192.168.1.x all it means if your NAS will now have a 192.168.1.x address. So long as you can finD it, you can access it.

If your client (pc) and your NAS are on DHCP then there really isn't anything to worry about. It's only when you fix ips you need to be a bit more on the ball.

I use a 5g router btw.

Note. If you currently are using a broadband router the 4g router needs to replace it, OR, you must disable DHCP server on one of the two devices.

Note note! If you use anyone other than Three, remote access will be a pain.


Edited by Griffith4ever on Thursday 4th December 09:42


Edited by Griffith4ever on Thursday 4th December 09:45

eeLee

975 posts

102 months

Thursday 4th December 2025
quotequote all
remote access will be easy.

Before putting it somewhere else, put Tailscale on it. Connect to it via Tailscale, no care about CGNAT, firewalls, anything.

Tailscale on your PC, Tailscale on the NAS. Connect over the Tailnet.

Ham_and_Jam

Original Poster:

3,347 posts

119 months

Thursday 4th December 2025
quotequote all
Griffith4ever said:
Where the router gets it's wan (internet)from is neither here nor there , devices on your Lan are the same, regardless of router. All you need concern yourself with is making sure it is on the same internal subnet if you want to give it the same address, even then it doesn't matter.

Your current dhcp pool might be 192.168.0.1 to 0.250, and your NAS is 192.168.0.51 . If your new router has a different pool, say 192.168.1.x all it means if your NAS will now have a 192.168.1.x address. So long as you can finD it, you can access it.

If your client (pc) and your NAS are on DHCP then there really isn't anything to worry about. It's only when you fix ips you need to be a bit more on the ball.

I use a 5g router btw.

Note. If you currently are using a broadband router the 4g router needs to replace it, OR, you must disable DHCP server on one of the two devices.

Note note! If you use anyone other than Three, remote access will be a pain.


Edited by Griffith4ever on Thursday 4th December 09:42


Edited by Griffith4ever on Thursday 4th December 09:45
Very helpful. Thankyou beer

I’ll have a trial run soon. Just so much going on.

Ham_and_Jam

Original Poster:

3,347 posts

119 months

Thursday 4th December 2025
quotequote all
eeLee said:
remote access will be easy.

Before putting it somewhere else, put Tailscale on it. Connect to it via Tailscale, no care about CGNAT, firewalls, anything.

Tailscale on your PC, Tailscale on the NAS. Connect over the Tailnet.
I’ve always used Synology QuickConnect for remote access.

Is Tailscale better or connect differently than QC?

Griffith4ever

6,294 posts

57 months

Friday 5th December 2025
quotequote all
eeLee said:
remote access will be easy.

Before putting it somewhere else, put Tailscale on it. Connect to it via Tailscale, no care about CGNAT, firewalls, anything.

Tailscale on your PC, Tailscale on the NAS. Connect over the Tailnet.
Ahh tailscale, indeed, but this chap doesn't even know how a LAN works, so installing client and server apps and setting them up is not what I class as "easy". More of a nuisance.

Anyhow, just a heads up to be aware of. Most people only find out about CGNAT when they can no longer access something remotely, and they are not there, so they can't fix it.

Ham_and_Jam

Original Poster:

3,347 posts

119 months

Monday 23rd February
quotequote all
Update:
Success!! So a new 4g router purchased and set up with same SSIDs / passwords / router IP address as the existing wired router.

My existing broadband contract finished on Saturday. So swapped over to the new router and everything just dropped back in, except for one out of two laptops which wouldn t connect to the printer. So re-installed it and all good.

The one worry was the Synology NAS, but it appears to be working so far. A couple of devices needed re-booting, but quite a painless exercise in the end.

I m sure I might tweak a few things, but happy enough so far.

We move to a new house next month, so hopefully I can just pick everything up, and it will just work on turning back on in its new location.


Edited by Ham_and_Jam on Monday 23 February 19:56