Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Manual de usuario Pagina 123

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Requirements Outside the ISP Network
302272-A Rev. 00 8-19
recognize the gateway address (RADIUS client) and provide addresses from a
second subnet.
A scope is a Microsoft term for a range of IP addresses on one subnet. To use
DHCP, you must define two scopes.
The first scope is a range of one IP address, which corresponds to the IP
address of the RADIUS client. At the same time, you must exclude that one
address from the range of available addresses, since it is already in use by the
RADIUS client.
The second scope is the range of IP addresses that you want to assign to
dial-in users.
Next, you must group these two scopes together under one name as a superscope.
You create a superscope because, when DHCP gets a request to assign an address,
it tries to assign it on the subnet from which it got the request. When the DHCP
server receives a request packet, it examines the gateway_address
field, which by
default is the same address as the RADIUS client. Although it finds a match in the
first scope, no address is available, so the assignment fails for that scope. It then
defaults to the next scope in the superscope to look for addresses there. Without
the superscope mechanism, the address assignment attempt stops after the first
attempt fails.
Note: If you are using Windows NT, you must have a tool such as the
Microsoft DHCP Manager™ for Windows NT
®
and Service Pack 3, which
supports superscopes.
Note: For dynamic IP address assignment using the Dynamic Host
Configuration Protocol (DHCP), configure one of the following addresses on
the RADIUS authentication server. Set the IP address for the user dialing in to
0.0.0.0 or 255.255.255.254. This address is passed to the NAS. When the NAS
recognizes either of these addresses, it initiates DHCP by sending an
address_request packet to the gateway, which forwards the packet to the
DHCP server specified in the tunnel management server (TMS).
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