In order to use DHCP, you need to install the ifup and isc-dhcp-client
packages, and manually create the following two symbolic links:
# ln -s ../rcS.d/S06ifupdown-clean ../rcS.d/S11networking /etc/rc.boot/
During execution at boot time, the S11networking script will emit some error
messages while trying to configure the loopback interface. These are not
fatal.
Debian GNU/Hurd doesn't currently execute's Debian standard /etc/rcS.d/* boot
scripts, but has its own /libexec/rc script -- which integrates scripts from
/etc/rc.boot/ instead.