Changing to new ISP

[Norman Watkins]

Hi all, I was wondering how best to cope with changing Internet Service Provider.
I have around 15x Sonoff switches flashed with Tasmota (14.5.0).  These are all just configured as switches and I access them using the excellent Tasmotrol app or through a browser.
In the UK currently I am with BT internet which has the ip range of 192.168.1.x
I am shortly moving to Virgin Media which has 192.168.0.x
I hope to have a few days of overlap at changeover. Looking a various sites online they say that the VM router can not be changed to the 192.168.1.x ip range. Apparently this is used to implement the 'Guest' function.
Can anyone give advice as to the best way to achieve this?
The Tasmota devices don't have static ip's but I have set them to 'Reserved' in the router config.

Thanks in advance.  Norman.

[Andrew Russell]

I added a Pi running PiHole for this very reason.

Fed up with ISP's routers having slightly different behavior around DNS for local devices.

So, I use the PiHole's DHCP and DNS, and don't really care what the ISP's router does.

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[Justin Adie]

Are all your tasmotised devices using fixed IPs?  If DHCP why does it matter if the ip prefix changes?  

In any event what I do is have a small web page that listens to the tasmota mqtt traffic and populates itself with the discovered tasmota devices. Result looks a bit like this.  The blocks are clickable and will work if you’re on the same subnet - devices are discovered wherever they are in the world, so long as they are talking to an accessible mqtt server.   You don’t need a device to host the web-page.  You can run it from the browser/desktop.  

[Philip Knowles]

I have never come across a router where you cannot change the address range. I've had routers from BT, plusnet and others. Sometimes you need to access an 'advanced' settings menu. The BT router will almost certainly be able to configured using one of the ethernet ports 'bridged' to the new router. There are good reasons to do that - many routers are limited to 32 devices and WiFi operates at the speed of the slowest device You might also be able to change the subnet mask to 255.255.0.0 on your devices (and the new router) which will enable you to use both 192.168.1.x and 192.168.0.x addresses.

The 'guest' Wifi should use a separate interface otherwise a device with 255.255.0.0 subnet would be able to access the main addresses.

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From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Norman Watkins <norman.w...@gmail.com>
Sent: 11 March 2025 16:38
To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Changing to new ISP

 

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[ap...@virgilio.it]

Justin, the “status page” you posted is a very nice solution

Do you make it with only an http page?

Or do you have a specific app in backgound to listen to MQTT traffic?

 

I’m looking for a way to display on a PC screen some variables transmitted by some tasmota nodes on my network. This seems to solve that

 

Can you share some details on it?

 

Alberto

 

Da: 'Justin Adie' via TasmotaUsers <sonof...@googlegroups.com>
Inviato: martedì 11 marzo 2025 18:53
A: Norman Watkins <norman.w...@gmail.com>
Cc: SonoffUsers <sonof...@googlegroups.com>
Oggetto: Re: Changing to new ISP

 

Are all your tasmotised devices using fixed IPs?  If DHCP why does it matter if the ip prefix changes?  

 

In any event what I do is have a small web page that listens to the tasmota mqtt traffic and populates itself with the discovered tasmota devices. Result looks a bit like this.  The blocks are clickable and will work if you’re on the same subnet - devices are discovered wherever they are in the world, so long as they are talking to an accessible mqtt server.   You don’t need a device to host the web-page.  You can run it from the browser/desktop.  

 

 

On 11 Mar 2025, at 16:38, Norman Watkins <norman.w...@gmail.com> wrote:

 

Hi all, I was wondering how best to cope with changing Internet Service Provider.
I have around 15x Sonoff switches flashed with Tasmota (14.5.0).  These are all just configured as switches and I access them using the excellent Tasmotrol app or through a browser.
In the UK currently I am with BT internet which has the ip range of 192.168.1.x
I am shortly moving to Virgin Media which has 192.168.0.x
I hope to have a few days of overlap at changeover. Looking a various sites online they say that the VM router can not be changed to the 192.168.1.x ip range. Apparently this is used to implement the 'Guest' function.
Can anyone give advice as to the best way to achieve this?
The Tasmota devices don't have static ip's but I have set them to 'Reserved' in the router config.

Thanks in advance.  Norman.

 

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[Justin Adie]

Sure. I will post the code here a little later in the day. 

[Justin Adie]

As promised, here is the code.  I’ve not tested this version (it uses CDNs; if you want a cloud independent solution download the bulima style sheet and the mqtt.js code and include it locally).  

This is an html page that you can open locally.  You could also easily rewrite this to be a pure js snip that you could store as a bookmark in your browser; just inject the html rather than have it in the document.

All user parameters are at the top of the document.  

One observation is that I’ve never bothered to fix the styling gremlins that place the Mac and IP addresses somewhat randomly.  

Have fun

Justin

[Norman Watkins]

Hi all, Thanks a lot for the informative and interesting responses.  I have much more to go on now.

Best Regards.  Norman