Question : Dual range TCP/IP and router problem

We have been assigned two class C IP ranges for our school
so that each of our 500 machines can go on the internet
through our single ISDN router which all the hubs and
switches connect to.

We used to have every machine with a static IP address, and
all worked fine. but now that we have the second IP range
we have tried to implement DHCP on the PDC controller and things are going wrong.
The DHCP server assigned out addresses from both IP ranges
to all machines no problem but now every machine will not
find the domain controller to validate the user name. If
we put Netbeui on the machine as well as TCP/ip then the
machine works fine (can even ping the server no problem).

Some of the machines DO work with just tcp/ip but not many
and they all have addresses from our original range.

We have been told this might be a problem with the ISDN
router which cant handle having two different IP ranges
on the same network...?

Any ideas?

Answer : Dual range TCP/IP and router problem

Thanks for the opportunity to play the game :-)

The easiest solution is to trade-in your two non-squential
class "C" ranges for two consecutive class "C"'s and
supernet your local network. This involves changing the
subnet mask on all the equipment from
255.255.255.0 to 255.255.254.0 and then you can assign
IP address from either group anywhere on the LAN as static
mappings or dynamically via DHCP.

Don't forget the change at the router :-)