4
•
Method
3
—The client requests prefixes through DHCPv6 and assigns them to downstream
hosts. The hosts then uses the prefixes to generate global IPv6 addresses. This method uses
the same principle of selecting address pools as method 2.
The device can assign a host an IPv6 address in either of the following ways:
•
When the host connects to the device directly or through a bridge device, the device can use
method 1 or method 2.
•
When the host accesses the device through a router, the device can use method 3 to assign an
IPv6 prefix to the router. The router assigns the prefix to the host to generate an IPv6 global
unicast address.
IPv6 DNS server address assignment
On IPv6 networks, two methods are available for the IPv6 DNS address assignment:
•
AAA authorizes the IPv6 DNS address and assigns this address to the host through RA
messages.
•
The DHCPv6 client requests an IPv6 DNS address from the DHCPv6 server.
PPP tasks at a glance
To configure PPP, perform the following tasks:
1.
Configuring PPP authentication
Choose one of the following tasks:
{
Configuring PAP authentication
{
Configuring CHAP authentication (authenticator name is configured)
{
Configuring CHAP authentication (authenticator name is not configured)
{
Configuring MS-CHAP or MS-CHAP-V2 authentication
Configure PPP authentication for high-security environments.
2.
(Optional.)
Configuring the polling feature
3.
(Optional.)
{
Configuring the PPP negotiation timeout time
{
Configuring IP address negotiation on the client
{
{
Configuring DNS server IP address negotiation on the client
{
{
4.
(Optional.)
Enabling IP header compression
IPHC is often used for voice communications over low-speed links.
5.
(Optional.)
Enabling PPP link quality monitoring
6.
(Optional.)
Configuring the NAS-Port-Type attribute
7.
(Optional.)
Configuring PPP authentication
About PPP authentication
You can configure several authentication modes simultaneously. In LCP negotiation, the
authenticator negotiates with the peer in the sequence of configured authentication modes until the
