The router they rented me is a terrible Netcomm thing which barely works so I'd prefer to use my own existing router which is an ASUS RT-N56U. This probably isn't a supported configuration but I don't really care.
So far I've managed to extract the PPPoE username and (apparently randomly generated) password from the provided router and have inputted this into the ASUS. I also set the MAC address to the same as the Netcomm in case that matters.
The internet works but seems to die intermittently and the logs confirm that every time connection is established it's immediately terminated, which leads me to believe it's an authentication problem:
Jan 4 15:09:36 pppd[522]: PAP authentication succeeded
Jan 4 15:09:36 pppd[522]: LCP terminated by peer
Jan 4 15:09:36 pppd[522]: Connect time 0.0 minutes.
Jan 4 15:09:36 pppd[522]: Sent 0 bytes, received 0 bytes.
Jan 4 15:09:36 RT-N56U: WAN up (ppp0)
Jan 4 15:09:37 PPPoE: Connected
Jan 4 15:09:37 RT-N56U: WAN down (ppp0)
Jan 4 15:09:37 PPPoE: Disconnected
Jan 4 15:09:39 pppd[522]: Connection terminated.
Jan 4 15:09:39 pppd[522]: Sent PADT
Jan 4 15:09:39 pppd[522]: Modem hangup
Has anyone done this before or have any pointers as to what's going on?