Transcript diameter

History
• Since created in 1995, RADIUS has been used to
provide authentication, authorization and generate
accounting information for dial-in users.
• However, it does not support roaming users
efficiently, and is not designed to support emerging
QoS (RSVP, IntServ, DiffServ) services.
• In March 1998, the IESG decided to close the
RADIUS WG to open the way for a more flexible
protocol for AAA services.
• In August 1998, a new BOF is created to design a
new AAA protocol.
DIAMETER
• Designed by Pat Calhoun in 1996, it provides AAA for
roaming users.
• Today, DIAMETER can also provide policy support
for VPN (Virtual Private Service), Voice over IP, Fax
over IP, Mobile IP, and resource management (or
Bandwidth Broker).
• DIAMETER protocol consists of two potions:
– Base Protocol: provide secure communication among
DIAMETER entities, feature discovery, and version
negotiation.
– Extensions: Build on top of the base protocol to provide
specific services.
DIAMETER Network Architecture
S2
S1
Servers: S1, S2
Clients: C1, C2, C3, C4
C1
Communications:
Peer-to-peer:
C3
Client-Server:
C2
C4
IP Telephony Service Network
Transit
ISPs
SIP Proxy
Caller
SIP Proxy
Callee
Router
Router
Regional
ISP B
Regional
ISP A
Policy Server A
Inter-carrier Accounting
Policy Server B
User Accounting (DIAMETER Extension)
Resource Management
Real-time Data
DIAMETER / SIP Extension
DIAMETER Server
DIAMETER Messages
DIAMETER Client
SIP Client
SIP Proxy Server
SIP
Messages
SIP
Messages
… Mechanism
Caller Proxy
Policy Server
Policy Server
Callee Proxy
Allow?
Yes
SIP INVITE
Accept?
Yes
SIP 200 (Success)
Register
SIP ACK
Register
SIP BYE
Release
Release