Win XP clients picking up ISP's DHCP not Local Area Network

J

James PP

Hi,

I've set up a Windows 2000 Server with AD and DNS configured and DHCP
running internally with a 192.168.0.0-254 scope active. I have 2 NICS
in the server one on cable and the other internal with NAT setup using
the default Win 2000 settings when using it as an Internet Router
through NAT (as opposed to ICS). Everything works correctly in that
internet is shared (with ProxyPlus) and the network is not accessible
publicly. However , when I switch cable on the Windows XP pro client
always picks up an external address (169.x.x.x) which is not from my
private range setup in DHCP. When I disable the cable connection and
renew the client settings (using ipconfig / renew) it correctly picks
up the server (192.168.0.1) as default gateway, DNS server and
correctly assigns 192.168.0.3 to this client.

What is happening to make the clients pick up my ISP's DHCP broadcasts
instead of the internal servers and have I done something really
stupid in my setup???

Thanks in advance for any help.

JPP
 
M

Marina Roos

The 169-address is not an external address, it means the client can't find
the DHCP-server. Check if that nic is set to obtain an IP automatically from
the DHCP-server.
On the server check the bindingorder and make sure the internal nic is on
top.
Have you set options 003, 006 and 015 in DHCP-server?

Marina
 
J

James PP

Hi Marina,

I didn't have the 003 server option set (I now have thanks) but the
only bound NIC was the Local Area Network. Still no joy. The minute I
unplug the cable connection and renew on the client, it works. Could
it be something needs to be added/ removed in Routing and Remote
Access (i.e. the NAT settings)??

Thanks for your kind help.


JPP
 
M

Marina Roos

Normally you wouldn't have to do anything in RRAS.
Can you give us the ipconfig/all from the server?

Marina
 
C

Chris Edson [MSFT]

Have you 'Authorized' you DHCP Server with your AD?

Also, what's the 'public' ip address that your ISP gives?

-Chris
--
==============================
Chris Edson
(e-mail address removed)

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