Add new scope in DHCP problem

[aunil321]

Hi, i use win server 2003. In DHCP, i want to add new scope for the
third segment but failed.

My current network's ip range is 10.96.81.1 to 10.96.81.254
subnet mask 255.255.248.0

I want to add the new range 10.96.82.1 to 10.96.82.30
subnet mask 255.255.248.0

then error occurs:
The address range and mask conflict with exsiting scoop.

Then i set subnet mask to 255.255.254.0

then error occurs:
The scope parameters are incorrect. Either the scope already exists or
its subnet address and mask is inconsistent with the subnet address and
mask of an existing scope.

How to solve it? Pls help. Thank you very much.

 

[Kurt]

Your subnet mask on BOTH scopes must not be narrower than 255.255.254.0 for
those two blocks to work, and actually - since they are exactly 1 number
apart - it really should be 255.255.255.0. If either scope does not have at
most a /23 subnet mask, they are both in the same subnet (or one is in the
same subnet as the other).

Just for the same of the math, with a mask of 255.255.253.0, the two
networks would be 10.96.80.0/23 and 10.96.82.0/23. Unless you want to route
between networks, you should just delete the current scope and add a larger
one.

....kurt

 

[aunil321]

Kurt 寫é“：

Your subnet mask on BOTH scopes must not be narrower than 255.255.254.0 for
those two blocks to work, and actually - since they are exactly 1 number
apart - it really should be 255.255.255.0. If either scope does not have at
most a /23 subnet mask, they are both in the same subnet (or one is in the
same subnet as the other).

Just for the same of the math, with a mask of 255.255.253.0, the two
networks would be 10.96.80.0/23 and 10.96.82.0/23. Unless you want to route
between networks, you should just delete the current scope and add a larger
one.

...kurt

hi Kurt, i' m understand now, thank you very much.