In addition to the poor ethics of this practice, it can cause real problems. A recent firmware update put my router into a continual cycle of connecting and disconnecting from the VDSL line for several hours. The only fix I've found so far was to disable the Apple Time Capsule I was using for WiFi and backup, and use the built-in wifi of the router. And it's still flakey. So, I'm going to try and replace the router with a third-party VDSL modem that I can actually control, rather than vice versa.
UPDATE: The modem arrived today. Setup was OK, but some of the information required product registration with Draytek, and other bits were on the BT customer support site. So, here it is, all in one place:
- The modem web interface is at http://192.168.2.1
- Set to pass through a PPoE connection.
- VDSL2 VLAN tag set to 101
- ADSL VPI/VCI set to 0/38 to PPoA (0/101 for MPoA) I think this is actually irrelevant unless you want to connect to an ADSL rather than a VDSL line.
- NOTE: You should change the login details for the modem web interface, for security reasons.
- Open AirPort Utility, go to the Internet tab, and set 'connect using' to PPoE.
- Enter the username and password. These (for my connection anyway) are: email@example.com and BT. Technically, there is no password, but the Time Machine will not accept this as an answer. BT support pages say to use the password 'BT' in these situations, and this works here.
- Service name should be left blank.
- Click Update.