My company has a class b ip address which is divided into class c subnets for use by different sites (eg – site 1 gets x.x.1.*, site 2 gets x.x.2.* – each site has more than 1 subnet – My own has 3). All use the same subnet mask (255.255.255.0)
My DHCP server serves all 3 subnets without problem, with 3 seperate scopes. Each other site has its own DHCP server.
When a laptop client leases an address at another site and visits here it cannot access the network.
I assume that it requests a renewal from its known DHCP server, doesn’t get a response so broadcasts a request. My own DHCP server gets the request, but declines since the originator has an IP address in the same subnet but with a scope handled by another server – hence no new address. (is this assumption correct?)
Manually releasing and renewing the address works OK (but renewing alone doesn’t), but this is unsuitable since regular users don’t have priveleges to do this.
The problem only affects NT4 machines and only “one-way” (moving back to another site works OK).
Question is – what can be done (without major changes) and why does it work OK “the other way”? I suspect it is a network hardware problem (routers/switches), but can’t be sure. More details available if required.
TIA
Paul