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28.

The interfaces file generated by pppoeconf appears to be invalid. This is probably because pppoeconf is unable to handle your original interfaces file. Should pppoeconf nevertheless change your interfaces file with the one that appears to be invalid?
If you agree, you will probably break your network connectivity after rebooting, and cause some local problems if lo is down. Your original interfaces file will be moved to $REALINTFILE~ so you can restore it.
If not, you will have to make sure that $iface is configured before starting your DSL connection and start the connection manually.

Note that this situation is not expected and you should consider submitting a bug report against pppoeconf including your original interfaces file and the one generated by pppoeconf.