Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Manual de usuario Pagina 62

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Configuring and Troubleshooting Bay Dial VPN Services
3-14 303509-A Rev 00
If the home network is configured to assign IP addresses dynamically using
DHCP, the DHCP server selects an IP address from its pool and issues the end
user a renewablelease” on that address. Alternatively, the DHCP
administrator may assign a fixed IP address to particular users. In either case,
the DHCP server returns the assigned IP address in its reply to the gateway.
If the home network is configured to assign IP addresses using RADIUS,
either statically or dynamically, the RADIUS server performs the address
allocation. If the RADIUS administrator has allocated a pool of assignable IP
addresses for dial-in users, and if the RADIUS client on the gateway is
configured for dynamic IP address assignment, the RADIUS server assigns an
address from that pool. Alternatively, the RADIUS administrator may have
assigned a specific address for that particular user. In this case, RADIUS uses
that assigned address. The RADIUS server reserves the assigned IP address
for that user until the session terminates.
7.
When authentication and address allocation are complete, the NAS starts
sending packets from the remote node to the gateway via the newly
created tunnel.
A Day in the Life of a Layer 3 Packet
The next sections explain how a packet moves through a Layer 3 Dial VPN
network and returns to the remote node. Figure 3-4 shows the process.
As the packet moves from the remote node to the home network, different pieces
of the Dial VPN network must encapsulate (add) and decapsulate (strip off) the
protocol-specific envelope around the data packet.
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