Create wifi from ethernet port

You need a WiFi Access Point.

Depending on how many devices you want to use and how fast you want your connection to be you can get something suitable from between €30 and €200. If you want to give good coverage throughout your garden you could increase your spend a bit.

it is different but the same. You can create the identical SSID and password on your new AP in the shed and devices will connect automatically. You may have issues with your device sticking on the original Wifi as you walk out there even if the signal is very low but a quick disconnect and connect will connect to the stronger/closer AP.

An access point will put you on the same network via a different wifi. Your existing router will hand out your IP address and it will be on the same network you use in the house. It's probably the most convenient way to be connected if you share printers or other devices.

If you call the new one shed-wifi it'll be easy to tell the difference. Much harder to work things out if you give them the same SSID and password as in the house, but if that's what you'd prefer to do just make certain that they are operating on different channels and don't let them do Auto.

The best answer for you depends on the budget you want to spend among other things.

If having the same SSID is important to you, consider a mesh system that does ethernet backhaul like the Google Nest Wifi or TPLink Deco.

Currys have the Deco M4 system with 3 units for €130 at the moment. Their more expensive units have more features, but that will connect over ethernet and also has a second ethernet port if you need to connect other devices.

That could leave you two to cover your house along with the one in the shed all with an app to manage them.

Your ISP Router is just used as a modem with a mesh setup, so it might or might not suit you. It would mean though that you own your own wireless network, so don't need to reconfigure it anytime you change broadband provider.

Don't buy a repeater/extender unless it says it has an access point mode - they feed a wireless connection to the ethernet port rather than the other way around.

CeX can be a surprisingly cheap source of decent older wifi routers, but do look up reviews of anything they have to see if it suits your needs.

The difference between a router and an access point is important here.

As has been said, a router will connect a new network that can't have the same addresses as your home network.

The difference with an access point is that it connects the wireless devices to the same IP network and does not hand out new addresses.

Many devices calling themselves Wifi Extenders just copy the wireless traffic and bounce you back to the main wireless network.

If you're thinking of buying something put the model name up here for advice on whether it's suitable or not.

It would be a mistake to buy something that doesn't do what you want it to do simply because it's easier to configure.

You only have to configure it once and can get help. You'll be using it day in and day out for a long time!

Sonos are very fussy about being on the same WiFi connection. Most other options just need you to be able to connect to the same network which can be by ethernet or by any attached WiFi network.

That EAP115 doubtfully worth money - 100Mbps LAN, 2.4GHz only, max300Mbps (this is Max theoretical, you still limited to a 100Mbps due to LAN)

If not going to mesh, just get some standard "router", set static IP on it, disable DHCP(both v4 and v6) and other unwanted features, set WiFi to your preference. Or just use it in AP mode.

You gain WiFi and will have spare Ethernet for wired connections.

AX1500 only 20 dearer then EAP115 but its WiFi6.

https://www.tp-link.com/us/home-networking/wifi-router/archer-ax1500/#specifications

A POE adapter for a unifi ap is only an extra €15 or so if you don't already have the option which is almost certain!

Will you have a desktop or any other internet connected devices in the shed?

Would you hope to have a sound system there too?

It might be worth getting a unit with a few ethernet ports for permanent connections.

Anything you can keep off wifi improves performance for everything that's left.

Thanks for the answers. Having that much Sonos gear changes the landscape a bit!

The "Eir Standard one" varies a little depending on when you got your install.

What they have in common is that they were the cheapest half way decent box they could find in bulk anywhere in the world at that time.

I've struggled with Sonos before when there were multiple access points.

I'd suggest now that you get a reasonable mesh system which supports ethernet backhaul like Deco M5 in Currys or CeX and turn off the wifi on your Eir router. Plug one unit in to the eir router directly and run the cable to your shed from the other port on the MESH ROUTER rather than the Eir router. Connect a second mesh unit in the shed and use it there. As far as Sonos is concerned they'll look like the same network and shouldn't trigger the refusal to work in multiple locations. You'll have to reconfigure for the new network from your Sonos App.

Most mesh kits are a pack of three, so it leaves you a mesh point to place in another location in the house if there are areas of weaker signal. This one can be wirelessly connected so you can be flexible with placing and it gives you an ethernet port for a TV or PC or something if there's one nearby.