We believe that your issue has been closed by the upload of
Version 2.0.12-1+grml.02 of live-boot from Christian Hofstaedtler <ch@grml.org>.
The explanation is attached below

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Fri, 10 Dec 2010 13:09:00 +0100
Source: live-boot
Binary: live-boot live-boot-initramfs-tools live-initramfs
Architecture: source all
Version: 2.0.12-1+grml.02
Distribution: unstable
Urgency: low
Maintainer: Grml Team <team@grml.org>
Changed-By: Christian Hofstaedtler <ch@grml.org>
Description: 
 live-boot  - Debian Live - System Boot Scripts
 live-boot-initramfs-tools - Debian Live - System Boot Scripts (initramfs-tools backend)
 live-initramfs - Debian Live - System Boot Scripts (transitional package)
Changes: 
 live-boot (2.0.12-1+grml.02) unstable; urgency=low
 .
   * Rely on the kernel and initramfs-tools for bootoption ip=. We therefore
     inherit their syntax. [Closes: issue477]
   * Properly configure DNS when resolvconf is installed and the system uses
     ip=dhcp for network configuration.
Checksums-Sha1: 
 5c49494238f2ef8d7947b879e31889c1f2f09f33 1921 live-boot_2.0.12-1+grml.02.dsc
 c7b4cf231d4c5cf80c6e21369184f4bf9610c510 23672 live-boot_2.0.12-1+grml.02.diff.gz
 2ee79d5a37fadef22809c47ffa0941af1954d80d 76656 live-boot_2.0.12-1+grml.02_all.deb
 97e6a3880de6a350edbff04a9489aaae02ce49c0 28406 live-boot-initramfs-tools_2.0.12-1+grml.02_all.deb
 c490c28dce9ca582124441a5f452597e406cc514 5274 live-initramfs_2.0.12-1+grml.02_all.deb
Checksums-Sha256: 
 18c26d0a79da5b57231d6a86ef6130144adbd61a714a31881673a0c896bbe15d 1921 live-boot_2.0.12-1+grml.02.dsc
 d56c52f0c1aac55d926df1dab4c4a0b23551de02e2fdeca0fd5acf4d6a9216be 23672 live-boot_2.0.12-1+grml.02.diff.gz
 55a53fc3b738d56a22eec2d92c7c30a32c4a5bc16fe248d10545e7da41b6fa39 76656 live-boot_2.0.12-1+grml.02_all.deb
 f15294914ac953c7516e07a7f13cd7febfea169b6f8027d383ad7ceec990ff0b 28406 live-boot-initramfs-tools_2.0.12-1+grml.02_all.deb
 4da0be483f139ae3a227642c4968dd3b85b23ccf0cf7cbcabb4e8c9d6066dc7a 5274 live-initramfs_2.0.12-1+grml.02_all.deb
Files: 
 392fca1f079b21c825237faa771261d7 1921 misc optional live-boot_2.0.12-1+grml.02.dsc
 844fa0b58c44477a11a6711f5041601e 23672 misc optional live-boot_2.0.12-1+grml.02.diff.gz
 1e129b39f31c33044313aa9f36e1efc1 76656 misc optional live-boot_2.0.12-1+grml.02_all.deb
 c6dd9b4a19ce13b0e52ef3a0b2807848 28406 misc optional live-boot-initramfs-tools_2.0.12-1+grml.02_all.deb
 13724b4b594143dc4ba02fdaef5bda83 5274 misc optional live-initramfs_2.0.12-1+grml.02_all.deb

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)
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=iZ/S
-----END PGP SIGNATURE-----

Current daily ISOs with live-boot support the following syntax:

  ip=device:ipaddress:netmask:gateway

The documentation of live-boot doesn't match this yet (reported to upstream), 
therefore leaving this bugreport open until we've documented this proberly.

Adding Marc to nosy list, being the initial feature requestor.

regards,
-mika-

JFTR: live-initramfs isn't yet reimplemented:

  http://live.debian.net/devel/live-initramfs/todo/
  http://live.debian.net/project/roadmap/

Though I'd like to investigate on the possibilities of ip=... and what might 
need to be adjusted so it proberly works for us.

Just a small update regarding this issue: I do not want to invent anything new 
before we've the redesign of live-initramfs available (which is planned for 
september, see upstream's mail: http://lists.debian.org/debian-live/2009/07/
msg00012.html).

Anyway, right now we *should* have the following boot option available already, 
according to the live-initramfs manpage:

       ip=[CLIENT_IP]:[SERVER_IP]:[GATEWAY_IP]:[NETMASK]:[HOSTNAME]:[DEVICE]:
[AUTOCONF] [,[CLIENT_IP]:[SERVER_IP]:[GATEWAY_IP]:[NETMASK]:[HOSTNAME]:[DEVICE]:
[AUTOCONF]]*
           Let you specify the name(s) and the options of the interface(s) that 
should be configured at boot time. Do not specify this if you want to use dhcp 
(default). It will be changed in a future release to mimick official kernel 
boot param specification (e.g. 
ip=10.0.0.1::10.0.0.254:255.255.255.0::eth0,:::::eth1:dhcp).

Let's figure out whether this works already or if it doesn't work let's find  
the cause for the problem.

Feature request by Marc Haber.
Possible syntax: ip=device,adresse,netmask,gateway