Posts Tagged ‘DHCP’

Reduce RAS initial DHCP Reservations

October 19th, 2010


I have a subnet that is running out of IP addresses.  RAS is taking up 10 ip addresses on the DHCP server even though I only have a small handful of users that will likely use the server at once. I wanted to reduce the number of IP’s initially reserved by RAS. 
Keywords: routing and remote access reduce dhcp reservations vpn.


Windows Server 2008 R2 standard. Also works on Server 2003 and likely Small Business Server 2003/2008


When looking on the DHCP Server there are 10 leases allocated to the VPN server.  


To reduce the number of initial leases/reservations that RAS takes you just have to change and/or create the following key in the registry:

Value Name: InitialAddressPoolSize
Data Type: REG_DWORD
Default: 10
The default is 10 leases, I wanted it at 3 so I just added the key above and set the key to 3.  This means that it will only take 3 IP addresses initially, if those are used it will request an additional 3 leases.

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