We believe that your issue has been closed by the upload of
Version 0.36 of grml-debootstrap from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Format: 1.8
Date: Sat, 27 Feb 2010 21:39:57 +0100
Source: grml-debootstrap
Binary: grml-debootstrap
Architecture: source all
Version: 0.36
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml-debootstrap - wrapper around debootstrap for installing plain Debian via grml
Changes: 
 grml-debootstrap (0.36) unstable; urgency=low
 .
   * Add support for specifying filesystem that should be created
     when installing to directories through --filesystem.
     [Closes: issue596]
   * Provide /etc/network/interfaces.examples file.
     [Closes: issue495]
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 83f6a29c08c0f53190e9bf2846aec5e1627618ed 138153 grml-debootstrap_0.36.tar.gz
 785acfdb60fcba78473a61a03a98ea4f5f8c20ca 113022 grml-debootstrap_0.36_all.deb
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Files: 
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Would be nice to get a /etc/network/interfaces version with grml-debootstrap 
which contains some often used examples.