
vi 303509-A Rev 00
RADIUS Accounting Server .............................................................................1-13
DHCP Server ...................................................................................................1-14
Additional Planning Information .............................................................................1-14
Where to Go Next .........................................................................................................1-14
Chapter 2
Dial VPN Layer 2 Tunneling
Building a Network for Layer 2 Tunneling .......................................................................2-2
L2TP Packet Encapsulation ............................................................................................2-4
Bay Networks L2TP Implementation ..............................................................................2-5
Tunnel Management in L2TP Tunnels ............................................................................2-6
Security in an L2TP Network ..........................................................................................2-7
Tunnel Authentication ...............................................................................................2-7
RADIUS User Authentication ...................................................................................2-9
RADIUS Accounting .....................................................................................................2-10
L2TP IP Interface Addresses ........................................................................................2-10
Remote Router Configuration ................................................................................2-11
Starting an L2TP Session .............................................................................................2-11
Examples of L2TP Tunnels ...........................................................................................2-12
Making a Connection Across an L2TP Network ...........................................................2-13
When Does Dial VPN Tear Down the Tunnel? .......................................................2-14
Chapter 3
Dial VPN Layer 3 Tunneling
Building a Network for Layer 3 Tunneling .......................................................................3-2
How Tunnel Management Works ....................................................................................3-4
Tunnel Management in an
erpcd
-Based Network ....................................................3-4
Tunnel Management in an All-RADIUS Network ......................................................3-5
How the TMS Database Works ................................................................................3-6
Dynamically Allocating IP Addresses .............................................................................3-6
Using DHCP for Dynamic IP Address Allocation .....................................................3-7
How DHCP Works ....................................................................................................3-7
Using RADIUS for Dynamic IP Address Allocation ..................................................3-9
How Dynamic IP Address Allocation Works ...................................................................3-9
Assigning Addresses ..............................................................................................3-10
Starting the Connection ................................................................................................3-12
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