So we migrated to systemd and this issues no longer exists with current daily
ISOs AFAICT.

Hi,

thanks for raising and digging into this issue!

I've tried to reproduce your steps using Virtualbox with grml64-small testing
build1641 (see /etc/grml_version). It indeed works when using only *one* network
interface, but as soon as using two network interfaces /etc/resolv.conf is empty
for me, so that seems to be part of the problem.

FTR: as soon as we run Grml with systemd (instead of file-rc) this issue is
gone, though the migration to systemd isn't finished yet.

regards,
-mika-

I hope I use that bugtracking tool right. :-)
Wanted to dig deeper into that release-stopper because I really like GRML.

- Downloaded the latest testing daily, booted it -> No "auto network" running.
- Checking system, learned that it now uses the new predictable network interface naming thingy from systemd 
(https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/)
- Rebooted the system and added net.ifnames=0 to the kernel parameters to disable these eno1 etc names
- Tadaa, network with dhcp running. Nameserver entry also in resolv.conf

The resolv.conf issue was "fixed" by switching from allow-hotplug to auto, but
now all DHCP requests/network configuration takes place blocking/running in
foreground instead of running in background during boot. :-/

May or may not be fixed: https://github.com/grml/live-boot-
grml/commit/214cc032c4713bfaaecb2fb3b4377589684c90ab :)

FTR: Still present with udev 223-2.

Verified, downgrading udev to 215 (apt-get install udev=215-5.1~grml.01
libudev1=215-5.1~grml.01) results in a working resolv.conf.

When booting the current daily ISOs and having DHCP available the network
interfaces get an IP as usual, but /etc/resolv.conf doesn't include any
nameserver entries. When manually executing "dhclient eth0" it's working fine
though.

Maybe related to udev v222-2 which introduced new interface handling (see
http://metadata.ftp-master.debian.org/changelogs/main/s/systemd/unstable_changelog)