Cisco DHCP Relay Agent - strange thing..

Hello,

I have worked the whole week to get our new-DHCP Schema working. - No it works, but i really don't know why...

Catalyst 3550 12G Configuration (Backbone Switch)

ip dhcp relay information trust-all

Interface Vlan 1 IP Adresses: Primary: 10.10.6.1/24 Secondary: 192.168.200.3/24

192.168.111.1/24 ...(many other addresses) ip helper address 192.168.201.254

Interface VLAN 610 primary: 192.168.201.3/24

I want that our DHCP Server (Win2003) serves our Clients with

10.10.6.x/24 IP Adresses. (and later 192.168.199.x/24, and other 192.168.x.x/24 Scopes)

The server has an interface in VLAN 610 and the DHCP-Server is bounded to that Interface.

When I use the configuration above, it works fine (The clients get

10.10.6.x/24 IPs and 192.168.199.x/24 IPs). But if I change the primary IP-Adress of VLAN 1 Interface to e.g. 192.168.200.3/24, the clients get no lease.

The leases reach the DHCP-Server, but it does'nt react on the DHCPDISCOVER (GIADDR ist the primary ip of the Switch). No DHCPOFFER, no log-file entry, the only chance to ensure, that the packets reach the server is to use a sniffer, like etheral.

Is this a problem of the Windows 2003 Server or an logical mistake by myself?

Best greets

Bjoern A. Hoefer