No DNS name in DNS Server

[E-B]

When I run a Windows maschine in my home network the dns-resolution works fine. (With nslookup I can find the machine name)
But when I run my Ubuntu Dapper machines (a laptop and a PC) I cannot ping both:
Host Name IP Address Creator
UNKNOWN 192.168.0.11 DHCP
UNKNOWN 192.168.0.8 DHCP

Im running Ubuntu Dapper newest version. My DNS Server is a Siemens Santis20 Server.

[E-B (ebelt9hf)]

/etc/network/interfaces:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
        script grep
        map eth1

iface eth1 inet dhcp

cat /etc/hostname
sun

[E-B (ebelt9hf)]

I have solved this problem, by adding this lines to /etc/dhcp3/dhclient.conf:
send host-name "sun";
send dhcp-client-identifier <MAC_ADRESSE>;

Know the name resolution is working...

[Hervé Fache (rvfh)]

AFAICS the send host-name line is the only one required. Still, I think the set-up should be done by the installer, and everytime the hostname is modified using the proper tools thereafter.

[E-B (ebelt9hf)]

Yes, +1
If this should be done, it is a bug in network-admin.?!

I don't understand why this will not be done by default and why it work on some dns-servers.