Link to home
Create AccountLog in
Avatar of DonWilder
DonWilderFlag for United States of America

asked on

After adding a new DHCP scope and subnet to Windows Server 2003, clients with new scope/subnet IPs can't connect to the domain.

I am imaging 40 refurbished Dell D630 Latitude laptops using GhostCast 2.0 Server Sessions and PRO DOS boot CDs .  The first 20 worked OK.  Working with Windows Server 2003. I needed more IPs so I create a second scope of IPs and joined them to the original with a superscope.

When DHCP started giving new scope IPs, from the new subnet, the client laptops were unable to join a GhostCast Session giving error messages 19913: "unable to start tcpip, can't find dhcp." I check DNS servers/replication and restarted DHCP.  

Now the error message is: Ghost Code 19901, contact Symantec Support. (I have no reply yet)

The Primary and secondary domain servers, gateway, dns, dhcp, ghost and the image are all in the original scope.  The laptops unable to connect to the ghostcast session have an IP in the new scope and subnet.  

Please tell me what needs to change so ghost can deliver images to laptops on the new scope?
Avatar of Chris Dent
Chris Dent
Flag of United Kingdom of Great Britain and Northern Ireland image


If the scopes have different subnet masks you'd need a router to pass traffic between subnets. DHCP is a little more complex, the router would have to act as a DHCP relay.

It would seem like you'd be better off extending your existing subnet rather than trying to add a new one.

Chris
Avatar of DonWilder

ASKER

Thank you, Chris.  It might be that I don't know how to do this at all.  My original domain dhcp distributes IPs xxx.xxx.xx1.1- xxx.xxx.xx1.256, subnet 255.255.255.0, to PCs, networked printers, wireless laptops.  The firewall is xxx.xxx.xx1.xxx  There is a domain controller, a backup domain controller running DHCP, a file server.  To add another 256 IPs I added a second scope, xxx.xxx.xx2.1 - xxx.xxx.xx2.256, subnet 255.255.0.0, and combined them in W2003 dhcp superscope.  

Is that different than extending the existing subnet?  If so, what numbers would be changed?  Do I use the original subnet 255.255.255.0 with the new IP range xxx.xxx.xx2.xxx?  Which numbers do I need to change in the original IP Range, and the original subnet range?

Don
What is exactly the xx1 number in first scope?

Morning :)

> To add another 256 IPs I added a second scope, xxx.xxx.xx2.1 - xxx.xxx.xx2.256, subnet
> 255.255.0.0, and combined them in W2003 dhcp superscope.  

Clients on your original subnet, with the 255.255.255.0 mask, will only be able to talk to other clients within that same subnet (e.g. xxx.xxx.xx1.1 to xxx.xxx.xx1.254). You'd need a Router or Firewall to handle the path to xxx.xxx.xx2.1 to xxx.xxx.xx2.254 (something present on both subnets).

Superscopes.... it's an administrative folder, it doesn't actually mean anything in DHCP or networking terms, just a way of organising your scopes if you want to.

I don't think MS DHCP allows you to extend an existing scope, although I'm not in a position to test that right now. Ultimately that's what you want to do, to change the current scope to something like xxx.xxx.xx0.1 to xxx.xxx.xx1.254 with a 255.255.254.0 subnet mask (giving you 510 usable IP addresses in the range).

e.g.

192.168.0.0 to 192.168.1.255 with a mask of 255.255.254.0.

Chris
Chris,
Thanks.  I will try that out.  I have read "Increasing the number of IP addresses on a subnet in DHCP Server", http://support.microsoft.com/kb/255999.  It says two ways - preferred being "resubnetting", second "superscoping".   A friend created the second scope by adding one to the original IP range xxx.xxx.16.0-254, 255.255.255.0; to make xxx.xxx.17.0-256, 255.255.0.0.  From what you say and the MS article says, the I should delete the original DHCP scopes and create a new one covering one extended subnet IP range (xxx.xxx.x6.0 to xxx.xxx.x7.255) with a new mask of 255.255.254.0.

The MS kb article gives a six step process including changing IP, subnet mask, and gateway IP on each statically-configured host.  I know the firewall is a router, all the servers are probably routers w static IPs, a NAS, and about 6 printers.  Soon to be added is a wireless router and 15 access points with all w static IPs reservered.  I have until New Years to get it all working again.  If I miss anything I guess it will become apparent.

Don
Dusan Bajic,

Thank you for your question.  xx1 number in the first scope is 16.  Please tell me how that helps and what numbers to modify.

Don  
ASKER CERTIFIED SOLUTION
Avatar of Chris Dent
Chris Dent
Flag of United Kingdom of Great Britain and Northern Ireland image

Link to home
membership
Create an account to see this answer
Signing up is free. No credit card required.
Create Account
It was a bit of a pain but it has worked without a hitch.

Don