Just switched to BT broadband - I have no problems connecting to the Wifi but as soon as I plug in the ethernet cable it blocks the connection completely. I've wanted to test the ethernet connection because my wifi connection often drops during video conferences which is very annoying - wanted to rule out the wifi itself as the reason for dropping.
Apple has the following guidance, but I've no idea where to get the info from https://support.apple.com/en-gb/guide/mac-help/mh11939/mac:
On your Mac, choose Apple menu
> System Preferences, then click Network.
Select Ethernet in the list on the left.
Click the Configure IPv4 pop-up menu, then choose your ISP’s recommended configuration method.
Using DHCP: Choose this if you receive an IP address automatically from your ISP.
Using DHCP with manual address: Choose this if you received a specific IP address and your ISP uses DHCP or other network settings.
Using BootP: Choose this if your ISP uses BootP.
Manually: Choose this if you received a specific IP address, a subnet mask and a router address from your ISP.
Click Advanced, click DNS, click the Add button
below DNS Servers, then enter the IP address of your ISP’s DNS server.
If your ISP gave you search domain addresses, enter them as well. These may not be needed if you configure your IP settings to use DHCP.
If you were given other settings from your service provider, such as IPv6, proxy server or additional Ethernet settings, click Advanced to enter them.
Click OK to make the settings active for the Ethernet service.
Solved! Go to Solution.
Those instructions appear to be for when you are making a direct connection to the internet via a modem, not when connecting to a router.
I have moved your post to a more appropriate board.
Unfortunately updating the lease didn't work though...