11-14-2013 12:32 PM - edited 03-07-2019 04:36 PM
I work for a very old company that owns a class B IP range. I've been given the task of moving our lan addresses to class C.
I was going to start with the following approach;
- create a new dhcp pool on existing win 2008 server with class C range
- create new corresponding vlan/subnet on switches with dhcp relay
- create new corresponding svi for the clan
- update GRE/ASA configs accordingly
Does this seem like the correct approach?
It is my understanding that dhcp "just works". So the two separate vlans/subnets should only get dhcp leases from their corresponding pool on my win 2008 server?
Thanks in advance.
11-14-2013 12:41 PM
Assuming that the DHCP scopes are configured correctly then yes each vlan should get addresses from its own scope.
In general the approach that you describe sounds reasonable. I am not entirely clear what is involved when you talk about GRE/ASA. Would providing for address translation for the new subnet be part of that? And I do not know enough about your network to know whether there need to be changes in routing protocols to create routing table entries for the new subnet.
HTH
Rick
11-14-2013 12:52 PM
The ASA/GRE part refers to our wan. Basically traffic flows like this;
Workstations > Core > ASA > INTERNET
OR
Workstations > Core > ASA > GRE > INTER-OFFICE
We have GRE for VPN tunnels.
11-14-2013 01:51 PM
I did a major IP address change at a large hospital. Your plan should work fine. It's pretty easy to get the endpoints migrated too. Just copy paste on the interface something like:
shut
switchport access vlan
no shut
The shut/no shut will cause the endpoint to send a dhcp request and get an address on the new subnet.
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