Name
Framed-IP-Address
Synopsis
Attribute Number |
8 |
Length |
6 |
Value |
IPADDR |
Allowed in |
Access-Request, Access-Accept |
Prohibited in |
Access-Reject, Access-Challenge |
Presence in Packet |
Not required |
Maximum Iterations |
1 |
In link-framed connections using
such
protocols as SLIP and PPP, the Framed-IP-Address
attribute carries, quite obviously, the value of the IP address to be
assigned to the connection. Depending on the origin of the
Access-Request
packet, the attribute has the
following different meanings:
- From the RADIUS client
The value of this attribute indicates the client’s preference in IP address. The RADIUS server does not have to assign this address, although it may do so.
- From the server to the client
The RADIUS server will assign the IP found in this attribute to the connection.
There are exceptions to that rule, however. There are two specific IP
values reserved for use by RADIUS. The address
255.255.255.255
is used when the client computer
negotiates for the IP it uses—this may be when the user has an
assigned static IP address and needs to communicate directly with the
IP provisioning equipment in order to get this address. The address
255.255.255.254
is used when the RADIUS client
issues the IP address.
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