Cisco Systems Cisco DHCP Relay Agent - strange thing..
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Cisco DHCP Relay Agent - strange thing.. bjoern.hoefer 01-20-06
Posted by on January 20, 2006, 8:26 am
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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


Posted by on January 20, 2006, 9:38 am
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Hello Bjoern,

how are your scopes defined ? I believe that with secondary addressing,
you will need a single superscope with a scope inside for each subnet
defined on your interface. So in your case that would mean a suoerscope
with scopes for 10.10.6.0/24, 192.168.200.0/24, 192.168.111.0/24 etc...

HTH,

helpdesk@solutionfionders.nl
www.solutionfinders.nl
We've got answers !


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