Name

Login-IP-Host

Synopsis

Attribute Number

14

Length

6

Value

IPADDR

Allowed in

Access-Request, Access-Accept

Prohibited in

Access-Reject, Access-Challenge

Presence in Packet

Not required

Maximum Iterations

Unlimited

This value carries the IP address of the host that provides the login service for a specific connection. Most commonly this IP address is the address of the actual host, but there are two reserved values that specialize the RADIUS client’s behavior. If a value of 255.255.255.255 (0xFFFFFFFF) is placed in this attribute, then the client needs to assign this host IP itself. If a value of 0.0.0.0 (0x00000000) is placed in this attribute, then the client user should determine and configure this IP address for his connection.

Multiple instances of this packet may be present. The RFC doesn’t specify what behavior the RADIUS client should present when it encounters this, but an educated guess would be to allow a selection of host IP addresses for redundancy, fault tolerance, and load balancing.

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