We are using a 16 bit subnet mask in our remote branches.
I don't know exactly why it was done this way other than to reduce to size of the route tables.
Each device is designated by the third octet of the ip address:
Servers = 10.2.10.x/16
Workstations = 10.2.40.x/16
Printers = 10.2.10.x/16
UPS = 10.2.200.x/16
and so on.
All devices are uisng the same default gateway and are in the same VLAN in the branch:
So, the other sites see this site as 10.2.0.0 in the route table.
The branch also has a voice subnet that is in a seperate VLAN and subnet with it's own default gateway:
Phones = 10.242.120.x
DG = 10.242.70.1/16
Both of these are trunked from the switch to the router, and the router is configured with subinterfaces for the two subnets.
My question is regarding the need to add additional subnets in the branch for VMWare.
We need two additional vlans in each branch.
If I go to a 24 bit subnet mask and begin to seperate everything at each branch, in addition to adding the additional vlans, the route tables are going to get much larger.
I am also limited to the number of address combinations I can use to seprate everything and still use the convention that has been established.
Would it be possible to leave the existing devices as they are and add two new vlans with default gateways (subinterfaces) to this site:
VMWare = 10.2.11.0/24
Default gateway = 10.2.11.254/24
VMWare2 = 10.2.21.0/24
Default gateway = 10.2.21.254/24
Is this possible to do without any adverse affects?