bad '/etc/network/interfaces' file

[Zhang]

Binary package hint: pppoeconf

Ubuntu: 8.10
pppoeconf: 1.18ubuntu1

The original '/etc/network/interfaces' file was:
###########################################################
auto lo
iface lo inet loopback

auto eth1
#iface eth1 inet dhcp

auto ath0
#iface ath0 inet dhcp

#auto wlan0 # um-hum
#iface wlan0 inet dhcp

# added by pppoeconf
# commented by me
#iface dsl-provider inet ppp
#provider dsl-provider
#
#auto eth2
#iface eth2 inet manual

###########################################################
(24 lines in total)

And after running pppoeconf, it becomes:
###########################################################
auto lo
iface lo inet loopback

auto eth1
#iface eth1 inet dhcp

auto ath0
#iface ath0 inet dhcp

#auto wlan0 # um-hum
#iface wlan0 inet dhcp

# added by pppoeconf
# commented by me
#iface dsl-provider inet ppp
pre-up /sbin/ifconfig eth2 up # line maintained by pppoeconf
#provider dsl-provider
#
#auto eth2
#iface eth2 inet manual

iface dsl-provider inet ppp
pre-up /sbin/ifconfig eth2 up # line maintained by pppoeconf
provider dsl-provider

auto eth2
iface eth2 inet manual

###########################################################
(32 lines in total)

pppoeconf says that the generated file is invalid, and should be reported as a bug.

Thanks.

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 8.10
NonfreeKernelModules: nvidia
Package: pppoeconf 1.18ubuntu1
PackageArchitecture: all
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pppoeconf
Uname: Linux 2.6.27-11-generic x86_64