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RRAS, IAS and Microsoft VPN server, why are RAS reservations in DHCP server?

Posted on 2007-10-17
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here is the scenario, i have a windows 2003 server with 2 nics.
I installed RRAS and IAS on this machine.
Both machines have internal(but different) IP's on the nics 192.168.1.20 on nicA and 192.168.2.21 on nicB(this is the one configured as the external ip on the vpn server because i am doing natting with my firewall to this ip)
I have configured the IAS to use active directory with its authentication and a the vpn(nic-B) as a radius client

my question is on my dhcp server which is a completely different server(its on my domain controller) i am seeing a bunch of IP addresses being taken up by the unique id "RAS", the name is the name of the server for all the ip's. why is this happening?
please advise.
thank you
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Question by:yalemort
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Brugh earned 2000 total points
ID: 20093602
Because your installed RRAS.  RAS is a Windows function that hands out IP addresses to remote users when they connect.  In order to NOT duplicate IP addresses, RAS will update the DHCP with those addresses and basically "reserve" them so that they don't get issued out by normal DHCP requests.

http://support.microsoft.com/kb/160699
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