Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Instrukcja Użytkownika Strona 55

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Dial VPN Layer 3 Tunneling
303509-A Rev 00 3-7
Using DHCP for Dynamic IP Address Allocation
This method requires a DHCP server on the home/corporate network. This server
communicates with a DHCP client proxy residing on the gateway. The server
dynamically allocates an IP address for a dial-in user when the client proxy
requests one.
Based on RFC 2131 and its extensions, DHCP provides a scalable method of
dynamically allocating IP addresses to remote users and a way of managing the IP
addresses dynamically assigned to dial-in users. This implementation supports:
Standard DHCP operation, as described in RFC 2131
Interoperation with standard DHCP servers
Use of both primary and secondary DHCP servers
DHCP leases with as many users as there are tunnels
Both Dial VPN (tunneled) and non-tunneled users
Getting IP addresses through either the local or the remote DHCP client
proxy, in addition to other methods that Dial VPN supports, depending on
how the Dial VPN subscriber is provisioned
How DHCP Works
DHCP implements the concept of IP address leasing. An authenticated dial-in
user receives an exclusive right to use an assigned IP address for a specific,
configurable period of time, called a “lease.” When this lease expires, the DCHP
client proxy can renew the lease or let it lapse, returning the IP address to the pool.
DHCP lets a network manager specify a range of assignable IP addresses without
requiring that each IP address be tied to a specific MAC (hardware) address. The
DHCP server leases an IP address to each dial-in user and dynamically maintains
a table that links a user’s IP and MAC addresses. For users who need a fixed IP
address, a network manager can also specify a permanent assignment. A single
NAS can communicate and maintain DHCP leases with as many DHCP servers as
there are ports on the NAS (up to 48 or 62, depending on the model).
When a remote user dials in to a network access server (NAS), Dial VPN
performs the usual authentication functions. When the gateway returns the Mobile
IP (MIP) authentication response to the NAS, however, the NAS sends the
gateway a MIP dynamic address allocation (DAA) request. The gateway sends a
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