A simple delegation issue

[Franz Edler]

Hello,

I need some help from an expert.
I have a zone "fhtw" and want to delegate the subdomain "d01.fhtw".
See my zone-file below.

The problem is, whenever I do a query for a domain-name in the delegated
zone (e.g. for "snom.d01.fhtw") the DNS-server for "fhtw-zone" answers with
"no such name" without asking the name-server of the delegated zone.

What is wrong in my zone file?

Regards
Franz


------------------ zone file for "fhtw -------------------
$TTL 1d
@		IN SOA		ns.fhtw.	root.fhtw. (
					2005100103	; serial
					3h		; refresh
					1h		; retry
					1d		; expiry
					1d )		; minimum

fhtw.				IN NS		ns.fhtw.
d01.fhtw			IN NS		ns.d01.fhtw.

ns.fhtw.			IN A		192.168.100.1
wpc.fhtw.			IN A		192.168.100.2

ns.d01.fhtw.		IN A		192.168.100.4